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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]        
Unrecognized postretirement benefits at beginning of period $ 188 $ (119) $ 188 $ (123)
Amortization of unrecognized transition obligation 0 0 0 5
Change in accumulated losses 0 6 0 4
Related deferred taxes 0 (2) 0 (1)
Unrecognized postretirement benefits at end of period $ 188 $ (115) $ 188 $ (115)