CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (57,111)us-gaap_NetIncomeLoss	$ 41,029us-gaap_NetIncomeLoss	$ (100,060)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income from discontinued operations		(147,752)	(3,019)
Gain on sale of assets		(5,844)crk_GainLossOnSaleOfAssets	(50,892)crk_GainLossOnSaleOfAssets
Deferred income taxes	(24,677)us-gaap_DeferredIncomeTaxExpenseBenefit	(56,291)us-gaap_DeferredIncomeTaxExpenseBenefit	(50,472)us-gaap_DeferredIncomeTaxExpenseBenefit
Dry hole costs, leasehold impairments and other exploration costs	19,003	32,984	61,300
Impairment of oil and gas properties	60,268us-gaap_ImpairmentOfOilAndGasProperties	652us-gaap_ImpairmentOfOilAndGasProperties	25,368us-gaap_ImpairmentOfOilAndGasProperties
Depreciation, depletion and amortization	378,275	337,134	343,858
(Gain) loss on derivative financial instruments	(8,175)	8,388	(21,256)
Cash settlements of derivative financial instruments	9,145us-gaap_DerivativeCashReceivedOnHedge	2,293us-gaap_DerivativeCashReceivedOnHedge	9,766us-gaap_DerivativeCashReceivedOnHedge
Loss on early extinguishment of debt		17,854
Amortization of debt discount, premium and issuance costs	4,097	6,074	5,277
Stock-based compensation	10,697us-gaap_ShareBasedCompensation	12,785us-gaap_ShareBasedCompensation	13,728us-gaap_ShareBasedCompensation
Excess income taxes from stock-based compensation	1,055	2,016	1,701
Decrease (increase) in accounts receivable	2,221	(12,674)	16,166
Decrease (increase) in other current assets	(7,366)	3,459	(972)
Increase (decrease) in accounts payable and accrued expenses	13,552	26,887	(30,772)
Net cash provided by continuing operations	400,984	268,994	219,721
Net cash provided by (used for) discontinued operations		(7,715)	42,508
Net cash provided by operating activities	400,984	261,279	262,229
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(634,787)	(422,244)	(385,034)
Proceeds from sales of oil and gas properties		174	141,936
Proceeds from sales of marketable securities		13,392	37,705
Investing activities of continuing operations	(634,787)	(408,678)	(205,393)
Cash flow from investing activities of discontinued operations:
Capital expenditures		(101,037)	(203,077)
Proceeds from sale of oil and gas properties		823,072	24,750
Investing activities of discontinued operations		722,035	(178,327)
Net cash provided by (used for) investing activities	(634,787)	313,357	(383,720)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings	370,750	305,000	515,912
Principal payments on debt	(100,000)us-gaap_RepaymentsOfLongTermDebt	(835,000)us-gaap_RepaymentsOfLongTermDebt	(390,000)us-gaap_RepaymentsOfLongTermDebt
Costs related to early extinguishment of debt		(12,471)
Debt issuance costs	(2,524)us-gaap_PaymentsOfDebtIssuanceCosts	(2,744)us-gaap_PaymentsOfDebtIssuanceCosts	(6,709)us-gaap_PaymentsOfDebtIssuanceCosts
Tax withholding related to stock grants	(2,349)	(1,680)
Repurchases of common stock	(8,086)	(9,232)
Excess income taxes from stock-based compensation	(1,055)	(2,016)	(1,701)
Dividends paid	(23,829)us-gaap_PaymentsOfDividends	(17,997)us-gaap_PaymentsOfDividends
Net cash provided by (used for) financing activities	232,907	(576,140)	117,502
Net decrease in cash and cash equivalents	(896)	(1,504)	(3,989)
Cash and cash equivalents, beginning of the year	2,967	4,471	8,460
Cash and cash equivalents, end of the year	$ 2,071	$ 2,967	$ 4,471

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- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

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-Paragraph 15

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-Publisher FASB

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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