Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 45,923	$ 180,675
Accounts receivable, net	181,025	197,598
Fair value of derivatives	28,610	14,338
Prepaid expenses and other current assets	8,897	8,613
Total current assets	264,455	401,224
Properties and equipment, net	4,231,257	3,933,467
Assets held-for-sale, net	1,647	40,084
Other assets	24,798	45,116
Total Assets	4,522,157	4,419,891
Current liabilities:
Accounts payable	195,703	150,067
Production tax liability	36,650	37,654
Fair value of derivatives	110,683	79,302
Funds held for distribution	97,611	95,811
Accrued interest payable	13,760	11,815
Other accrued expenses	33,777	42,987
Total current liabilities	488,184	417,636
Long-term debt	1,154,528	1,151,932
Deferred income taxes	187,183	191,992
Asset retirement obligations	73,905	71,006
Fair value of derivatives	26,426	22,343
Other liabilities	94,557	57,333
Total liabilities	2,024,783	1,912,242
Commitments and contingent liabilities
Stockholders' Equity:
Common shares - par value $0.01 per share, 150,000,000 authorized, 65,999,010 and 65,955,080 issued as of March 31, 2018 and December 31, 2017, respectively	660	659
Additional paid-in capital	2,504,663	2,503,294
Retained earnings (deficit)	(6,435)	6,704
Treasury shares - at cost, 29,255 and 55,927 as of March 31, 2018 and December 31, 2017, respectively	(1,514)	(3,008)
Total stockholders' equity	2,497,374	2,507,649
Total Liabilities and Stockholders' Equity	$ 4,522,157	$ 4,419,891