Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,425	$ 180,675
Accounts receivable, net	195,317	197,598
Fair value of derivatives	14,817	14,338
Prepaid expenses and other current assets	6,744	8,613
Total current assets	218,303	401,224
Properties and equipment, net	4,192,608	3,933,467
Assets held-for-sale, net	0	40,084
Other assets	31,243	45,116
Total Assets	4,442,154	4,419,891
Current liabilities:
Accounts payable	215,150	150,067
Production tax liability	56,766	37,654
Fair value of derivatives	186,605	79,302
Funds held for distribution	102,354	95,811
Accrued interest payable	12,561	11,815
Other accrued expenses	35,888	42,987
Total current liabilities	609,324	417,636
Long-term debt	1,179,117	1,151,932
Deferred income taxes	141,811	191,992
Asset retirement obligations	73,549	71,006
Fair value of derivatives	36,430	22,343
Other liabilities	61,617	57,333
Total liabilities	2,101,848	1,912,242
Commitments and contingent liabilities
Stockholders' Equity:
Common shares - par value $0.01 per share, 150,000,000 authorized, 66,133,025 and 65,955,080 issued as of June 30, 2018 and December 31, 2017, respectively	661	659
Additional paid-in capital	2,509,693	2,503,294
Retained earnings (deficit)	(166,692)	6,704
Treasury shares - at cost, 67,169 and 55,927 as of June 30, 2018 and December 31, 2017, respectively	(3,356)	(3,008)
Total stockholders' equity	2,340,306	2,507,649
Total Liabilities and Stockholders' Equity	$ 4,442,154	$ 4,419,891