CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 233,412	$ 194,057
Restricted cash	56,380	24,506
Receivables:
Joint interest billings, net	134,565	63,249
Oil sales	0	54,195
Related party	780	0
Other	25,616	25,893
Inventories	71,861	74,380
Prepaid expenses and other	9,306	7,209
Derivatives	1,682	31,698
Total current assets	533,602	475,187
Property and equipment:
Oil and gas properties, net	2,310,973	2,700,889
Other property, net	6,855	8,003
Property and equipment, net	2,317,828	2,708,892
Other assets:
Equity method investment	236,514	0
Restricted cash	15,194	54,632
Long-term receivables - joint interest billings	34,941	45,663
Deferred financing costs, net of accumulated amortization of $13,951 and $11,213 at December 31, 2017 and December 31, 2016, respectively	2,510	5,248
Long-term deferred tax assets	22,517	37,827
Derivatives	39	3,808
Other	29,458	10,208
Total assets	3,192,603	3,341,465
Current liabilities:
Accounts payable	141,787	220,627
Accrued liabilities	219,412	129,706
Derivatives	67,531	19,692
Total current liabilities	428,730	370,025
Long-term liabilities:
Long-term debt, net	1,282,797	1,321,874
Derivatives	30,209	14,123
Asset retirement obligations	66,595	63,574
Deferred tax liabilities	476,548	482,221
Other long-term liabilities	10,612	8,449
Total long-term liabilities	1,866,761	1,890,241
Shareholders’ equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2017 and December 31, 2016	0	0
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 398,599,457 and 395,859,061 issued at December 31, 2017 and December 31, 2016, respectively	3,986	3,959
Additional paid-in capital	2,014,525	1,975,247
Accumulated deficit	(1,073,202)	(850,410)
Treasury stock, at cost, 9,188,819 and 9,101,395 shares at December 31, 2017 and December 31, 2016, respectively	(48,197)	(47,597)
Total shareholders’ equity	897,112	1,081,199
Total liabilities and shareholders’ equity	$ 3,192,603	$ 3,341,465

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.