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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 2,104,768,000 us-gaap_StockholdersEquity | $ 41,804,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (3,349,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 703,475,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 104,547,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,258,291,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance (in shares) at Dec. 31, 2011 |  | 418,039,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 808,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 131,730,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  | 131,730,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Exercise of stock appreciation rights | (6,708,000)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 44,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (6,752,000)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 438,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock amortization and vesting | (919,000)cog_StockAmortizationAndVesting | 238,000 cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (1,157,000)cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock amortization and vesting (in shares) |  | 2,384,000 cog_StockAmortizationAndVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Purchase of treasury stock | 0 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |
Purchase of treasury stock (in shares) | 0 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |
Cash dividends at $0.08, $0.06 and $0.04 per share for the year ended December 31, 2014, 2013 and 2012, respectively | (16,757,000)us-gaap_DividendsCommonStockCash |  |  |  |  | (16,757,000)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Other comprehensive income (loss) | (80,667,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (80,667,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance at Dec. 31, 2012 | 2,131,447,000 us-gaap_StockholdersEquity | 42,086,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (3,349,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 695,566,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 23,880,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,373,264,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance (in shares) at Dec. 31, 2012 |  | 420,861,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 808,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 279,773,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  | 279,773,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Exercise of stock appreciation rights | (13,226,000)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 38,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (13,264,000)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 382,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock amortization and vesting | 9,802,000 cog_StockAmortizationAndVesting | 77,000 cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 9,725,000 cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock amortization and vesting (in shares) |  | 772,000 cog_StockAmortizationAndVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit of stock-based compensation | 18,913,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 18,913,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Purchase of treasury stock | (164,634,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (164,634,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Purchase of treasury stock (in shares) | 4,800,000 us-gaap_TreasuryStockSharesAcquired |  | 4,810,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Cash dividends at $0.08, $0.06 and $0.04 per share for the year ended December 31, 2014, 2013 and 2012, respectively | (25,232,000)us-gaap_DividendsCommonStockCash |  |  |  |  | (25,232,000)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Other comprehensive income (loss) | (32,241,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (32,241,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance at Dec. 31, 2013 | 2,204,602,000 us-gaap_StockholdersEquity | 42,201,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (167,983,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 710,940,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (8,361,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,627,805,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance (in shares) at Dec. 31, 2013 |  | 422,015,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,618,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 104,468,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  | 104,468,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock amortization and vesting | 958,000 cog_StockAmortizationAndVesting | 91,000 cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 867,000 cog_StockAmortizationAndVesting / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock amortization and vesting (in shares) |  | 900,000 cog_StockAmortizationAndVestingShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit of stock-based compensation | (1,375,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | (1,375,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Purchase of treasury stock | (138,852,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (138,852,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Purchase of treasury stock (in shares) | 4,300,000 us-gaap_TreasuryStockSharesAcquired |  | 4,275,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Cash dividends at $0.08, $0.06 and $0.04 per share for the year ended December 31, 2014, 2013 and 2012, respectively | (33,278,000)us-gaap_DividendsCommonStockCash |  |  |  |  | (33,278,000)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Other comprehensive income (loss) | 6,210,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 6,210,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balance at Dec. 31, 2014 | $ 2,142,733,000 us-gaap_StockholdersEquity | $ 42,292,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (306,835,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 710,432,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (2,151,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,698,995,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance (in shares) at Dec. 31, 2014 |  | 422,915,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,893,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |

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