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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rental Expense      
Aggregate rental expense for leased assets $ 4,708us-gaap_LeaseAndRentalExpense $ 4,199us-gaap_LeaseAndRentalExpense $ 3,421us-gaap_LeaseAndRentalExpense
Operating Leases, Future Rental Payments      
2015 4,861us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 3,864us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 2,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 314us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 3,958us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 15,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue