CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 212,917	$ 275,004
Restricted cash	28,557	28,533
Receivables:
Joint interest billings	65,677	67,200
Oil sales		35,950
Other	29,193	34,882
Inventories	67,227	85,173
Prepaid expenses and other	11,092	24,766
Derivatives	155,796	182,640
Total current assets	570,459	734,148
Property and equipment:
Oil and gas properties, net	2,528,527	2,314,226
Other property, net	7,725	8,613
Property and equipment, net	2,536,252	2,322,839
Other assets:
Restricted cash	7,313	7,325
Long-term receivables - joint interest billings	38,513	37,687
Deferred financing costs, net of accumulated amortization of $9,159 and $8,475 at March 31, 2016 and December 31, 2015, respectively	7,302	7,986
Long-term deferred tax assets	30,866	33,209
Derivatives	40,675	59,856
Other	3,439
Total assets	3,234,819	3,203,050
Current liabilities:
Accounts payable	237,188	295,689
Accrued liabilities	142,104	159,897
Derivatives	1,473	1,155
Total current liabilities	380,765	456,741
Long-term liabilities:
Long-term debt	1,013,596	860,878
Derivatives	12,377	4,196
Asset retirement obligations	45,122	43,938
Deferred tax liabilities	497,895	502,189
Other long-term liabilities	8,942	9,595
Total long-term liabilities	$ 1,577,932	$ 1,420,796
Shareholders' equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at March 1, 2016 and December 31, 2015
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 394,163,942 and 393,902,643 issued at March 31, 2016 and December 31, 2015, respectively	$ 3,942	$ 3,939
Additional paid-in capital	1,943,280	1,933,189
Accumulated deficit	(623,679)	(564,686)
Treasury stock, at cost, 9,006,216 and 8,812,054 shares at March 31, 2016 and December 31, 2015, respectively	(47,421)	(46,929)
Total shareholders' equity	1,276,122	1,325,513
Total liabilities and shareholders' equity	$ 3,234,819	$ 3,203,050