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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 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 |  | 7,778 | $ 4,024 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  | 43 | 30 |  |
Other comprehensive income |  | 7,821 | 4,054 |  |
Balance, End of Period |  | 799,023 |  |  |
AOCI, Pension and other postretirement benefit plans, tax |  | 9,549 | 9,144 | $ 9,563 | $ 9,160
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax |  | 225 | (65) | $ (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 |  | 7,000 | 4,138 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  | 0 | 0 |  |
Other comprehensive income |  | 7,000 | 4,138 |  |
Balance, End of Period |  | (10,983) | (42,308) |  |
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 |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  | 43 | 30 |  |
Other comprehensive income | [1] | 43 | 30 |  |
Balance, End of Period | [1] | (47,155) | (45,786) |  |
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 |  | 778 | (114) |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  | 0 | 0 |  |
Other comprehensive income | [2] | 778 | (114) |  |
Balance, End of Period | [2] | 804 | (114) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Balance, Beginning of Period |  | (65,155) | (92,262) |  |
Balance, End of Period |  | $ (57,334) | $ (88,208) |  |
[1] | Net of taxes of $9,549 and $9,563 as of March 31, 2018 and December 31, 2017, respectively. Net of taxes of $9,144 and $9,160 as of March 31, 2017 and December 31, 2016, respectively.
[2] | Net of taxes of $225 and $15 as of March 31, 2018 and December 31, 2017, respectively. Net of taxes of $65 and $0 as of March 31, 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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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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