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Comprehensive Income (loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Liability Adjustment, Balance at Beginning of the Period $ (7) $ 113 $ (43) $ 95
Pension Liability Adjustment, Other comprehensive income (loss):        
Pension Liability Adjustment, Net change from periodic revaluations, net of taxes 0 0 0 0
Pension Liability Adjustment, Total Other comprehensive income (loss) before reclassifications, net of taxes (7) 113 (43) 95
Pension Liability Adjustment, Net amount reclassified to earnings 18 8 54 26
Pension Liability Adjustment, Balance at End of the Period 11 121 11 121
Fair value of Derivatives, Balance at Beginning of the Period (1,150) (362) 80 (1,122)
Fair value of Derivatives, Other comprehensive income (loss):        
Fair value of Derivatives, Net change from periodic revaluations, net of taxes 301 969 (1,198) 2,402
Fair value of Derivatives, Total Other comprehensive income (loss) before reclassifications, net of taxes (849) 607 (1,118) 1,280
Fair value of Derivatives, Net amount reclassified to earnings (876) (442) (607) (1,115)
Fair value of Derivatives, Balance at End of the Period (1,725) 165 (1,725) 165
Accumulated Other Comprehensive Income (loss), Balance at Beginning of the period (1,157) (249) 37 (1,027)
Accumulated Other Comprehensive Income (loss), Other comprehensive income (loss):        
Accumulated Other Comprehensive Income (loss), Net change from periodic revaluations, net of taxes 301 969 (1,198) 2,402
Accumulated Other Comprehensive Income (loss), Total Other comprehensive income (loss) before reclassifications, net of taxes (856) 720 (1,161) 1,375
Accumulated Other Comprehensive Income (loss), Net amount reclassified to earnings (858) (434) (553) (1,089)
Accumulated Other Comprehensive Income (loss), Balance at End of the period $ (1,714) $ 286 $ (1,714) $ 286