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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases      
Total rent expense $ 5,100,000us-gaap_LeaseAndRentalExpense $ 3,900,000us-gaap_LeaseAndRentalExpense $ 2,700,000us-gaap_LeaseAndRentalExpense
Aggregate minimum rental commitments under non-cancelable operating leases      
2015 2,405,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 2,090,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 1,908,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 1,708,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 1,694,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 8,167,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 17,972,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue