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Employee Benefit Plans, Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract]        
Unamortized net actuarial loss $ (186) $ (186) $ (100)  
Unrecognized transition obligation 0 (5) (27)  
Total (186) (191) (127)  
Deferred tax benefit at 35% 67 68 45  
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (119) $ (123) $ (82) $ (87)
Deferred tax benefit 35.00%