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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ 1,020,755 |  |  |
Other comprehensive income (loss) before reclassifications |  |  | (10,501) | $ (1,505) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 121 | (249) |  |
Other comprehensive income (loss) | $ 2,816 | $ 6,390 | (10,380) | (1,754) |  |
Balance, end of period | 1,076,662 | 962,582 | 1,076,662 | 962,582 |  |
AOCI, Pension and other postretirement benefit plans, tax | 1,923 | 2,172 | 1,923 | 2,172 | $ 1,951 | $ 2,368
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax | 0 | 598 | 0 | 598 | $ 0 | $ 282
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (32,771) | (55,049) | (19,575) | (46,905) |  |
Other comprehensive income (loss) | 2,816 | 6,390 | (10,380) | (1,754) |  |
Balance, end of period | (29,955) | (48,659) | (29,955) | (48,659) |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | (10,571) | (35,478) |  |
Other comprehensive income (loss) before reclassifications |  |  | (10,501) | (1,265) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | 0 |  |
Other comprehensive income (loss) |  |  | (10,501) | (1,265) |  |
Balance, end of period | (21,072) | (36,743) | (21,072) | (36,743) |  |
Pension and Other Postretirement Benefits |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | (9,004) | (10,455) |  |
Other comprehensive income (loss) before reclassifications |  |  | 0 | 626 |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 121 | 85 |  |
Other comprehensive income (loss) |  |  | 121 | 711 |  |
Balance, end of period | (8,883) | (9,744) | (8,883) | (9,744) |  |
Derivative Instrument Designated as Cash Flow Hedge |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | 0 | (972) |  |
Other comprehensive income (loss) before reclassifications |  |  | 0 | (866) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | (334) |  |
Other comprehensive income (loss) |  |  | 0 | (1,200) |  |
Balance, end of period | $ 0 | $ (2,172) | $ 0 | $ (2,172) |  |

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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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