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Leasing Arrangements (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capital Leases      
2015 $ 1,064,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
2016 1,064,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
2017 1,064,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
2018 1,064,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
2019 1,064,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and thereafter 3,639,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Total minimum lease payments 8,959,000us-gaap_CapitalLeasesFutureMinimumPaymentsDue    
Amounts representing interest 1,747,000us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments    
Present value of net minimum lease payments 7,212,000us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments    
Operating Leases      
2015 6,474,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 5,875,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,359,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 3,550,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 3,017,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and thereafter 9,461,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total minimum lease payments 32,736,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Leasing Arrangements (Textual) [Abstract]      
Operating lease term maximum 25 years    
Operating lease expense $ 8,700,000us-gaap_OperatingLeasesRentExpenseNet $ 9,400,000us-gaap_OperatingLeasesRentExpenseNet $ 9,000,000us-gaap_OperatingLeasesRentExpenseNet