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Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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 (loss), defined benefit pension items     129  
Pension liability adjustment, net of tax 64 58 129 195
Ending balance, Defined Benefit Pension Items (2,059)   (2,059)  
Beginning balance, Gains (Losses) on Cash Flow Hedges     (85)  
Other comprehensive income before reclassifications, Gains (Losses) on Cash Flow Hedges     196  
Amounts reclassified from accumulated other comprehensive income (loss), Gains (Losses) on Cash Flow Hedges     (41)  
Net current period other comprehensive income, Gains (Losses) on Cash Flow Hedges 44 14 155 (17)
Ending balance, Gains (Losses) on Cash Flow Hedges 70   70  
Beginning Balance, Total     (2,273)  
Other comprehensive income before reclassifications, Total     196  
Amounts reclassified from accumulated other comprehensive income (loss), Total     88  
Net current period other comprehensive income, Total 108 72 284 178
Ending Balance, Total $ (1,989)   $ (1,989)