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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | $ 933,900 | $ 848,324 |
Other comprehensive income (loss) before reclassifications | 24,658 | (12,240) |
Amounts reclassified to earnings | 2,672 | 44,169 |
Net other comprehensive income (loss) for period | 27,330 | 31,929 |
Ending Balance | 1,020,755 | 933,900 |
AOCI, Pension and other postretirement benefit plans, tax | 1,951 | 2,368 | $ 9,984
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax | 0 | 282 | $ (106)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (46,905) | (78,834) |
Ending Balance | (19,575) | (46,905) |
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (35,478) | (30,488) |
Other comprehensive income (loss) before reclassifications | 24,907 | (4,990) |
Amounts reclassified to earnings | 0 | 0 |
Net other comprehensive income (loss) for period | 24,907 | (4,990) |
Ending Balance | (10,571) | (35,478) |
Pension and Other Postretirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (10,455) | (48,700) |
Other comprehensive income (loss) before reclassifications | 1,255 | (6,079) |
Amounts reclassified to earnings | 196 | 44,324 |
Net other comprehensive income (loss) for period | 1,451 | 38,245 |
Ending Balance | (9,004) | (10,455) |
Derivative Instrument Designated as Cash Flow Hedge |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (972) | 354 |
Other comprehensive income (loss) before reclassifications | (1,504) | (1,171) |
Amounts reclassified to earnings | 2,476 | (155) |
Net other comprehensive income (loss) for period | 972 | (1,326) |
Ending Balance | $ 0 | $ (972) |

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- Definition Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax + References No definition available. + Details
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- Definition Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax + References No definition available. + Details
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