Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Payable and Accrued Liabilities, Current [Abstract]
Drilling and lease operating cost accruals	$ 139,711	$ 126,500
Trade accounts payable	56,047	77,573
Revenue and severance tax payable	94,806	60,328
Property taxes	18,694	13,222
Compensation	31,486	39,471
Derivative settlements	1,287	12,644
Interest	40,840	45,057
Other	20,328	11,835
Total accounts payable and accrued expenses	$ 403,199	$ 386,630