Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Business Acquisition Pro Forma Information Incremental Items (Parenthetical) (Details)

v3.3.1.900
Acquisitions and Divestitures - Business Acquisition Pro Forma Information Incremental Items (Parenthetical) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Long-term debt, less current maturities $ 1,196,855 $ 1,352,120  
Federal statutory income tax rate 35.00% 35.00% 35.00%
Woodside Properties      
Business Acquisition [Line Items]      
Long-term debt, less current maturities   $ 55,000  
Federal statutory income tax rate   35.00%  
Woodside Properties | Revolving Credit Facility      
Business Acquisition [Line Items]      
Effective interest rate   1.80%  
Callon Properties      
Business Acquisition [Line Items]      
Long-term debt, less current maturities     $ 83,000
Federal statutory income tax rate     35.00%
Callon Properties | Revolving Credit Facility      
Business Acquisition [Line Items]      
Effective interest rate     2.00%