CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 194,057	$ 275,004
Restricted cash	24,506	28,533
Receivables:
Joint interest billings, net	63,249	67,200
Oil sales	54,195	35,950
Other	25,893	34,882
Inventories	74,380	85,173
Prepaid expenses and other	7,209	24,766
Derivatives	31,698	182,640
Total current assets	475,187	734,148
Property and equipment:
Oil and gas properties, net	2,700,889	2,314,226
Other property, net	8,003	8,613
Property and equipment, net	2,708,892	2,322,839
Other assets:
Restricted cash	54,632	7,325
Long-term receivables - joint interest billings	45,663	37,687
Deferred financing costs, net of accumulated amortization of $11,213 and $8,475 at December 31, 2016 and December 31, 2015, respectively	5,248	7,986
Long-term deferred tax assets	37,827	33,209
Derivatives	3,808	59,856
Other	10,208
Total assets	3,341,465	3,203,050
Current liabilities:
Accounts payable	220,627	295,689
Accrued liabilities	129,706	159,897
Derivatives	19,692	1,155
Total current liabilities	370,025	456,741
Long-term liabilities:
Long-term debt	1,321,874	860,878
Derivatives	14,123	4,196
Asset retirement obligations	63,574	43,938
Deferred tax liabilities	482,221	502,189
Other long-term liabilities	8,449	9,595
Total long-term liabilities	1,890,241	1,420,796
Shareholders' equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2016 and December 31, 2015
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 395,859,061 and 393,902,643 issued at December 31, 2016 and 2015, respectively	3,959	3,939
Additional paid-in capital	1,975,247	1,933,189
Accumulated deficit	(850,410)	(564,686)
Treasury stock, at cost, 9,101,395 and 8,812,054 shares at December 31, 2016 and 2015, respectively	(47,597)	(46,929)
Total shareholders' equity	1,081,199	1,325,513
Total liabilities and shareholders' equity	$ 3,341,465	$ 3,203,050