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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]        
Unrecognized postretirement benefits at beginning of period $ (125) $ 188 $ (125) $ 188
Amortization of unrecognized transition obligation 0 0 0 0
Change in unamortized net actuarial gain (loss) 0 0 0 0
Related deferred taxes 0 0 0 0
Unrecognized postretirement benefits at end of period $ (125) $ 188 $ (125) $ 188