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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income [Roll Forward]    
Balance at beginning of period $ (12,780) $ (11,856)
Other comprehensive income (loss) before reclassifications 289 (160)
Amounts reclassified from accumulated other comprehensive loss, net of tax 190 239
Net current period other comprehensive income, net of tax 479 79
Accumulated other comprehensive loss (12,301) (11,777)
Unrecognized pension and postretirement benefits    
Accumulated Other Comprehensive Income [Roll Forward]    
Balance at beginning of period (11,968) (11,891)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss, net of tax 190 239
Net current period other comprehensive income, net of tax 190 239
Accumulated other comprehensive loss (11,778) (11,652)
Foreign currency    
Accumulated Other Comprehensive Income [Roll Forward]    
Balance at beginning of period (812) 35
Other comprehensive income (loss) before reclassifications 289 (160)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Net current period other comprehensive income, net of tax 289 (160)
Accumulated other comprehensive loss $ (523) $ (125)