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Intangible Assets (Estimated Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Intangible Assets, Amortization Expense, Fiscal Year Maturity [Abstract]  
2015 $ 1,385us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 834us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 613us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 613us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 510us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total $ 3,955cob_FiniteLivedIntangibleAssetsFutureEstimatedAmortizationExpense