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Accumulated Other Comprehensive Income (Loss) - Components of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from AOCI, tax $ (4,994,000) $ (133) $ (4,994,000)
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of period 288,470 303,503 277,451
Other comprehensive income (loss) before reclassifications   (509) (281)
Amounts reclassified from accumulated other comprehensive income, net of tax   333 13,168
Net current period other comprehensive income (loss), net of tax   (176) 12,887
Balance at end of period 295,230 323,639 295,230
Accounting Standards Update 2018-02      
Increase (Decrease) in Stockholders' Equity      
ASU adoption impact     (1,700)
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, net of tax   333 13,168
Net current period other comprehensive income (loss), net of tax   333 13,168
Balance at end of period (129) 693 (129)
Unrecognized pension and postretirement benefits | Accounting Standards Update 2018-02      
Increase (Decrease) in Stockholders' Equity      
ASU adoption impact     (1,700)
Foreign currency      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of period   220 704
Other comprehensive income (loss) before reclassifications   (509) (281)
Amounts reclassified from accumulated other comprehensive income, net of tax   0 0
Net current period other comprehensive income (loss), net of tax   (509) (281)
Balance at end of period 423 (289) 423
Accumulated other comprehensive income (loss)      
Increase (Decrease) in Stockholders' Equity      
Balance at beginning of period (5,508) 580 (10,893)
Balance at end of period 294 $ 404 294
Accumulated other comprehensive income (loss) | Accounting Standards Update 2018-02      
Increase (Decrease) in Stockholders' Equity      
ASU adoption impact $ (1,700)   $ (1,700)