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Financial Instruments Financial Instruments Details 1 (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
3.24% $100 Million Interest Rate Swap [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Interest Rate Derivative Liabilities, at Fair Value $ (3,218,000)   $ (3,218,000)   $ (5,312,000)
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) 0 (281,000) (239,000) (123,000)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 (173,000) (147,000) (76,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (787) (777) (2,333) (2,299)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net, Net of Tax (484) (478) (1,435) (1,414)  
2.52% $50 Million Interest Rate Swap [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Interest Rate Derivative Liabilities, at Fair Value (314,000)   (314,000)    
Interest Rate Derivative Assets, at Fair Value         1,269,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) 0 (198,000) (1,582,000) 717,000  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 (122,000) (973,000) 441,000  
Foreign Exchange Forward [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Foreign Currency Cash Flow Hedge Asset at Fair Value 607,000   607,000   268,000
Foreign Currency Cash Flow Hedge Liability at Fair Value 0   0   (103,000)
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 493,000 (229,000) 887,000 (1,579,000)  
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax 392,000 (182,000) 705,000 (1,255,000)  
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 247 (486) 453 (1,517)  
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings, Net, After Tax $ 197 $ (386) $ 360 $ (1,206)