Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Liabilities
Accrued oil and gas capital expenditures	$ 54,674	$ 76,398
Accrued revenue and royalty distributions	44,411	51,292
Accrued lease operating and workover expense	17,250	10,113
Accrued interest	23,567	21,521
Accrued taxes	4,427	4,226
Other	10,892	20,281
Accrued liabilities	$ 155,221	$ 183,831