Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Schedule of Adjusted of the Condensed Consolidating Statements of Cash Flows (Details)

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Basis of Presentation - Schedule of Adjusted of the Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets $ 8,929 $ 4,439    
Accounts payable, accrued liabilities and other (20,013) (7,204)    
Net cash provided by operating activities 80,910 274,460    
Changes in operating assets and liabilities associated with investing activities (50,849)      
Net cash used in investing activities (202,552) (271,168)    
Net cash provided by financing activities 103,647 4,755    
Decrease in cash and cash equivalents (17,995) 8,047    
Cash and cash equivalents 5,671 23,847 $ 23,666 $ 15,800
Parent Company        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets (31,091) (139,575)    
Accounts payable, accrued liabilities and other (74,370) 206,754    
Net cash provided by operating activities (65,504) 208,438    
Changes in operating assets and liabilities associated with investing activities (28,671)      
Net cash used in investing activities (56,138) (205,146)    
Net cash provided by financing activities 103,647 4,755    
Decrease in cash and cash equivalents (17,995) 8,047    
Cash and cash equivalents 5,671 $ 23,847 $ 23,666 $ 15,800
Energy VI        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets 94,890      
Net cash provided by operating activities 146,414      
Changes in operating assets and liabilities associated with investing activities (22,178)      
Net cash used in investing activities (147,859)      
Net cash provided by financing activities 1,445      
Previously Reported        
Basis Of Presentation [Line Items]        
Accounts payable, accrued liabilities and other (70,862)      
Net cash provided by operating activities 30,061      
Net cash used in investing activities (151,703)      
Net cash provided by financing activities 103,647      
Decrease in cash and cash equivalents (17,995)      
Cash and cash equivalents 5,671      
Previously Reported | Parent Company        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets (8,913)      
Accounts payable, accrued liabilities and other (125,219)      
Net cash provided by operating activities (94,175)      
Net cash used in investing activities (27,467)      
Net cash provided by financing activities 103,647      
Decrease in cash and cash equivalents (17,995)      
Cash and cash equivalents 5,671      
Previously Reported | Energy VI        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets 72,712      
Net cash provided by operating activities 124,236      
Net cash used in investing activities (125,681)      
Net cash provided by financing activities 1,445      
Adjustment        
Basis Of Presentation [Line Items]        
Accounts payable, accrued liabilities and other 50,849      
Net cash provided by operating activities 50,849      
Changes in operating assets and liabilities associated with investing activities (50,849)      
Net cash used in investing activities (50,849)      
Adjustment | Parent Company        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets (22,178)      
Accounts payable, accrued liabilities and other 50,849      
Net cash provided by operating activities 28,671      
Changes in operating assets and liabilities associated with investing activities (28,671)      
Net cash used in investing activities (28,671)      
Adjustment | Energy VI        
Basis Of Presentation [Line Items]        
Prepaid expenses and other assets 22,178      
Net cash provided by operating activities 22,178      
Changes in operating assets and liabilities associated with investing activities (22,178)      
Net cash used in investing activities $ (22,178)