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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | $ 766,573 | $ 635,786 | $ 584,582
Other comprehensive income (loss) before reclassifications | (11,986) | 28,457 |
Actuarial net loss incurred in the fiscal year | (1,678) | (1,481) |
Amounts reclassified from accumulated other comprehensive loss | (15) | 131 |
Net current-period other comprehensive income (loss) | (13,679) | 27,107 |
Ending Balance | 848,324 | 766,573 | 635,786
AOCI, Pension and other postretirement benefit plans, tax | 9,984 | 9,563 | 9,160
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax | 106 | 15 | 0
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (17,983) | (46,446) |
Other comprehensive income (loss) before reclassifications | (12,505) | 28,463 | (5,081)
Actuarial net loss incurred in the fiscal year | 0 | 0 |
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 |
Net current-period other comprehensive income (loss) | (12,505) | 28,463 |
Ending Balance | (30,488) | (17,983) | (46,446)
Accumulated Other Comprehensive Income (Loss) Pension and Other Postretirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (47,198) | (45,816) |
Other comprehensive income (loss) before reclassifications | 0 | 0 |
Actuarial net loss incurred in the fiscal year | (1,678) | (1,481) | 1,106
Amounts reclassified from accumulated other comprehensive loss | 176 | 99 | 160
Net current-period other comprehensive income (loss) | (1,502) | (1,382) |
Ending Balance | (48,700) | (47,198) | (45,816)
Derivative Instruments Designated as Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 26 | 0 |
Other comprehensive income (loss) before reclassifications | 519 | (6) | 0
Actuarial net loss incurred in the fiscal year | 0 | 0 |
Amounts reclassified from accumulated other comprehensive loss | (191) | 32 |
Net current-period other comprehensive income (loss) | 328 | 26 |
Ending Balance | 354 | 26 | 0
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (65,155) | (92,262) | (88,458)
Ending Balance | $ (78,834) | $ (65,155) | $ (92,262)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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