Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments - Cash Receipts (Payments) on Derivative Settlements, Net Included within Net Cash Provided by Operating Activities (Details)

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Derivative Financial Instruments - Cash Receipts (Payments) on Derivative Settlements, Net Included within Net Cash Provided by Operating Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]      
Derivatives cash (payments) receipts, net $ (28,164) $ 4,199 $ 4,746