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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]    
Unrecognized postretirement benefits at beginning of period $ 188 $ (123)
Amortization of unrecognized transition obligation 0 5
Related deferred taxes 0 (1)
Unrecognized postretirement benefits at end of period $ 188 $ (119)