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Employee Benefit Plans, Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 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) (13)    
Total (182)   (191) (113)    
Deferred tax benefit at 35% 67   68 41    
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (115) $ 115 $ (123) $ (72) $ 77 $ 87
Deferred tax benefit 35.00%