CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 275,004	$ 554,831
Restricted cash	28,533	15,926
Receivables:
Joint interest billings	67,200	60,592
Oil sales	35,950	61,731
Other	34,882	41,221
Inventories	85,173	55,354
Prepaid expenses and other	24,766	25,278
Deferred tax assets		32,268
Derivatives	182,640	163,275
Total current assets	734,148	1,010,476
Property and equipment:
Oil and gas properties, net	2,314,226	1,773,186
Other property, net	8,613	11,660
Property and equipment, net	2,322,839	1,784,846
Other assets:
Restricted cash	7,325	16,125
Long-term receivables - joint interest billings	37,687	14,174
Deferred financing costs, net of accumulated amortization of $8,475 and $6,404 at December 31, 2015 and December 31, 2014, respectively	7,986	2,846
Long-term deferred tax assets	33,209	9,182
Derivatives	59,856	89,210
Total assets	3,203,050	2,926,859
Current liabilities:
Accounts payable	295,689	184,400
Accrued liabilities	159,897	201,967
Deferred tax liabilities		61,683
Derivatives	1,155	721
Total current liabilities	456,741	448,771
Long-term liabilities:
Long-term debt	860,878	748,362
Derivatives	4,196	68
Asset retirement obligations	43,938	44,023
Deferred tax liabilities	502,189	337,961
Other long-term liabilities	9,595	8,715
Total long-term liabilities	$ 1,420,796	$ 1,139,129
Shareholders' equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2015 and December 31, 2014
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 393,902,643 and 392,443,048 issued at December 31, 2015 and December 31, 2014, respectively	$ 3,939	$ 3,924
Additional paid-in capital	1,933,189	1,860,190
Accumulated deficit	(564,686)	(494,850)
Accumulated other comprehensive income	0	767
Treasury stock, at cost, 8,812,054 and 5,555,088 shares at December 31, 2015 and December 31, 2014, respectively	(46,929)	(31,072)
Total shareholders' equity	1,325,513	1,338,959
Total liabilities and shareholders' equity	$ 3,203,050	$ 2,926,859