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Comprehensive Income (loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pension Liability Adjustment, Balance at Beginning of the Period $ (116) $ (43)
Pension Liability Adjustment, Other comprehensive income (loss):    
Pension Liability Adjustment, Net change from periodic revaluations, net of taxes (15) 0
Pension Liability Adjustment, Total other comprehensive income (loss) before reclassifications, net of taxes (131) (43)
Pension Liability Adjustment, Net amount reclassified to earnings 10 18
Pension Liability Adjustment, Balance at End of the Period (121) (25)
Fair Value of Derivatives, Balance at Beginning of the Period (576) 80
Fair Value of Derivatives, Other comprehensive income (loss):    
Fair Value of Derivatives, Net change from periodic revaluations, net of taxes 270 (317)
Fair Value of Derivatives, Total other comprehensive income (loss) before reclassifications, net of taxes (306) (237)
Fair Value of Derivatives, Net amount reclassified to earnings 385 308
Fair Value of Derivatives, Balance at End of the Period 79 71
Accumulated Other Comprehensive Income (loss), Balance at Beginning of the period (692) 37
Accumulated Other Comprehensive Income (loss), Other comprehensive income (loss):    
Accumulated Other Comprehensive Income (loss), Net change from periodic revaluations, net of taxes 255 (317)
Accumulated Other Comprehensive Income (loss), Total other comprehensive income (loss) before reclassifications, net of taxes (437) (280)
Accumulated Other Comprehensive Income (loss), Net amount reclassified to earnings 395 326
Accumulated Other Comprehensive Income (loss), Balance at End of the period $ (42) $ 46