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Employee Benefit Plans, Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract]            
Unamortized net actuarial loss $ (182)   $ (186) $ (100)    
Unrecognized transition obligation 0   (5) (20)    
Total (182)   (191) (120)    
Deferred tax benefit at 35% 67   68 43    
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (115) $ 119 $ (123) $ (77) $ 82 $ 87
Deferred tax benefit 35.00%