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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share    
Net income attributable to common shares $ 4,568us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 2,733us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - basic 21,372,157us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 20,992,758us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of potentially dilutive common shares:    
Stock options 382,603cor_IncrementalCommonSharesAttributableToStockOptions 364,158cor_IncrementalCommonSharesAttributableToStockOptions
Unvested awards 223,547cor_IncrementalCommonSharesAttributableToRestrictedStockUnits 164,922cor_IncrementalCommonSharesAttributableToRestrictedStockUnits
Weighted-average common shares outstanding - diluted 21,978,307us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 21,521,838us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share attributable to common shares    
Basic (in dollars per share) $ 0.21us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.21us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted
Weighted-average potentially dilutive securities excluded in calculation of basic and diluted income (loss) per share 70,153us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 262,473us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount