Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Derivative Financial Instruments - Cash Receipts on Derivative Settlements, Net Included within Net Cash Provided by Operating Activities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Cash receipts on derivative settlements, net $ 713 $ 4,105