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Changes in Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of accumulated other comprehensive income (loss)    
Beginning balance, Defined Benefit Pension Items $ (2,188)  
Other comprehensive income before reclassifications, Defined Benefit Pension Items     
Amounts reclassified from accumulated other comprehensive income, Defined Benefit Pension Items 65  
Pension liability adjustment, net of tax 65 137
Ending balance, Defined Benefit Pension Items (2,123)  
Beginning balance, Gains (Losses) on Cash Flow Hedges (85)  
Other comprehensive income before reclassifications, Gains (Losses) on Cash Flow Hedges 127  
Amounts reclassified from accumulated other comprehensive income, Gains (Losses) on Cash Flow Hedges (16)  
Net current period other comprehensive income, Gains (Losses) on Cash Flow Hedges 111 (31)
Ending balance, Gains (Losses) on Cash Flow Hedges 26  
Beginning Balance, Total (2,273)  
Other comprehensive income before reclassifications, Total 127  
Amounts reclassified from accumulated other comprehensive income, Total 49  
Net current period other comprehensive income, Total 176 106
Ending Balance, Total $ (2,097)