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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | $ 766,573 |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (7,196) | $ 16,295 |  |
Actuarial net gain incurred in the fiscal year |  |  |  |  | 334 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 87 | 143 |  |
Other comprehensive income (loss) |  | $ (14,930) | $ 12,717 | (7,109) | 16,772 |  |
Balance, End of Period |  | 804,785 |  | 804,785 |  |  |
AOCI, Pension and other postretirement benefit plans, tax |  | 9,536 | 8,961 | 9,536 | 8,961 | $ 9,563 | $ 9,160
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax |  | 316 | (187) | 316 | (187) | $ (15) | $ 0
Foreign currency translation adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | (17,983) | (46,446) |  |
Other comprehensive income (loss) before reclassifications |  |  |  | (8,293) | 16,730 |  |
Actuarial net gain incurred in the fiscal year |  |  |  |  | 0 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 0 | 0 |  |
Other comprehensive income (loss) |  |  |  | (8,293) | 16,730 |  |
Balance, End of Period |  | (26,276) | (29,716) | (26,276) | (29,716) |  |
Funded status of pension plans and other postretirement benefits |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | (47,198) | (45,816) |  |
Other comprehensive income (loss) before reclassifications |  |  |  | 0 | 0 |  |
Actuarial net gain incurred in the fiscal year |  |  |  |  | 334 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 87 | 36 |  |
Other comprehensive income (loss) | [1] |  |  | 87 | 370 |  |
Balance, End of Period | [1] | (47,111) | (45,446) | (47,111) | (45,446) |  |
Unrealized gain (loss) on derivative instruments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | 26 | 0 |  |
Other comprehensive income (loss) before reclassifications |  |  |  | 1,097 | (435) |  |
Actuarial net gain incurred in the fiscal year |  |  |  |  | 0 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 0 | 107 |  |
Other comprehensive income (loss) | [2] |  |  | 1,097 | (328) |  |
Balance, End of Period | [2] | 1,123 | (328) | 1,123 | (328) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | (65,155) | (92,262) |  |
Other comprehensive income (loss) |  |  |  | (7,109) |  |  |
Balance, End of Period |  | $ (72,264) | $ (75,490) | $ (72,264) | $ (75,490) |  |
[1] | Net of taxes of $9,536 and $9,563 as of June 30, 2018 and December 31, 2017, respectively. Net of taxes of $8,961 and $9,160 as of June 30, 2017 and December 31, 2016, respectively.
[2] | Net of taxes of $316 and $15 as of June 30, 2018 and December 31, 2017, respectively. Net of taxes of $187 and $0 as of June 30, 2017 and December 31, 2016, respectively.

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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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