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Accumulated Other Comprehensive Income (Loss) - Components of and Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amounts reclassified from AOCI, tax $ (4) $ (21)
Increase (Decrease) in Stockholders' Equity    
Balance at beginning of period 580 (10,893)
Other comprehensive income (loss) before reclassifications (257) 421
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (12) 61
Net current period other comprehensive income (loss), net of tax (269) 482
Accumulated other comprehensive income (loss) 311 (10,411)
Unrecognized pension and postretirement benefits    
Increase (Decrease) in Stockholders' Equity    
Balance at beginning of period 360 (11,597)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (12) 61
Net current period other comprehensive income (loss), net of tax (12) 61
Accumulated other comprehensive income (loss) 348 (11,536)
Foreign currency    
Increase (Decrease) in Stockholders' Equity    
Balance at beginning of period 220 704
Other comprehensive income (loss) before reclassifications (257) 421
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Net current period other comprehensive income (loss), net of tax (257) 421
Accumulated other comprehensive income (loss) $ (37) $ 1,125