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Leases (Future annual minimum rental commitments) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Rental expense $ 5,600,000us-gaap_LeaseAndRentalExpense $ 5,100,000us-gaap_LeaseAndRentalExpense $ 3,700,000us-gaap_LeaseAndRentalExpense
Future annual minimum rental commitments      
2015 4,278,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 4,307,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 3,650,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 2,273,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 2,298,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 3,673,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 20,479,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue