Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net Income	$ (477,077)us-gaap_NetIncomeLoss	$ 5,442us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operation activities -
Depreciation, depletion, and amortization	60,698	62,651
Write-down of oil and gas properties	502,569us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Accretion of asset retirement obligation	1,365	1,386
Deferred income taxes	(79,491)us-gaap_DeferredIncomeTaxExpenseBenefit	6,265us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expenses	879us-gaap_ShareBasedCompensation	1,784us-gaap_ShareBasedCompensation
Other Noncash Income (Expense)	373us-gaap_OtherNoncashIncomeExpense	(2,862)us-gaap_OtherNoncashIncomeExpense
(Increase) Decrease in accounts receivable	7,880	(2,834)
Increase (decrease) in accounts payable and accrued liabilities	(9,646)	6,288
Increase (decrease) in accrued interest	(8,320)	(8,421)
Net Cash Provided by Operating Activities	(770)	69,699
Cash Flows from Investing Activities:
Additions to property and equipment	(49,173)	(105,589)
Proceeds from the sale of property and equipment	0	35
Net Cash Used in Investing Activities	(49,173)	(105,554)
Cash Flows from Financing Activities:
Proceeds from bank borrowings	103,400us-gaap_ProceedsFromLinesOfCredit	115,300us-gaap_ProceedsFromLinesOfCredit
Payments of bank borrowings	(53,700)us-gaap_RepaymentsOfLinesOfCredit	(82,600)us-gaap_RepaymentsOfLinesOfCredit
Net proceeds from issuances of common stock	302	824
Purchase of treasury shares	(154)	(855)
Net Cash Used in Financing Activities	49,848	32,669
Net Increase (Decrease) in Cash and Cash Equivalents	(95)	(3,186)
Cash and Cash Equivalents at Beginning of Period	406	3,277
Cash and Cash Equivalents at End of Period	311	91
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	$ 25,979us-gaap_InterestPaidNet	$ 26,310us-gaap_InterestPaidNet

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