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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | $ 635,786 |  |  |  |  |
Other comprehensive income (loss) before reclassifications (4) |  |  |  | 16,295 | [1] | $ 5,197 |  |  |
Actuarial net gain (loss) incurred in the fiscal year | [1] |  |  | 334 |  |  |  |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 143 | [1] | 82 | [2] |  |
Other comprehensive income (loss) |  | $ 12,717 | $ (5,688) | 16,772 |  | 5,279 |  |  |
Balance, End of Period |  | 718,255 |  | 718,255 |  |  |  |  |
AOCI, Pension and other postretirement benefit plans, tax |  | 8,961 | 9,840 | 8,961 |  | 9,840 |  | $ 9,160 | $ 9,879
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax |  | 187 | 0 | 187 |  | 0 |  | $ 0 | $ 5
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | (46,446) |  | (41,365) |  |  |
Other comprehensive income (loss) before reclassifications (4) |  |  |  | 16,730 | [1] | 5,197 |  |  |
Actuarial net gain (loss) incurred in the fiscal year | [1] |  |  | 0 |  |  |  |  |
Amounts reclassified from accumulated other comprehensive (income) loss |  |  |  | 0 | [1] | 0 | [2] |  |
Other comprehensive income (loss) |  |  |  | 16,730 |  | 5,197 |  |  |
Balance, End of Period |  | (29,716) | (36,168) | (29,716) |  | (36,168) |  |  |
Funded status of pension plans and other postretirement benefits |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, Beginning of Period | [3] |  |  | (45,816) |  | (47,082) |  |  |
Other comprehensive income (loss) before reclassifications (4) | [3] |  |  | 0 | [1] | 0 |  |  |
Actuarial net gain (loss) incurred in the fiscal year | [1],[3] |  |  | 334 |  |  |  |  |
Amounts reclassified from accumulated other comprehensive (income) loss | [3] |  |  | 36 | [1] | 71 | [2] |  |
Other comprehensive income (loss) | [3] |  |  | 370 |  | 71 |  |  |
Balance, End of Period | [3] | (45,446) | (47,011) | (45,446) |  | (47,011) |  |  |
Reclassification from AOCI, Current Period, Tax |  |  |  | 39 |  | 199 |  |  |
Unrealized gain (loss) on derivative instruments |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, Beginning of Period | [4] |  |  | 0 |  | (11) |  |  |
Other comprehensive income (loss) before reclassifications (4) | [1],[4] |  |  | (435) |  |  |  |  |
Actuarial net gain (loss) incurred in the fiscal year | [1],[4] |  |  | 0 |  |  |  |  |
Amounts reclassified from accumulated other comprehensive (income) loss | [4] |  |  | 107 | [1] | 11 | [2] |  |
Other comprehensive income (loss) | [4] |  |  | (328) |  | 11 |  |  |
Balance, End of Period | [4] | (328) | 0 | (328) |  | 0 |  |  |
Reclassification from AOCI, Current Period, Tax |  |  |  | 5 |  | (187) |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, Beginning of Period |  |  |  | (92,262) |  | (88,458) |  |  |
Other comprehensive income (loss) |  |  |  | 16,772 |  |  |  |  |
Balance, End of Period |  | $ (75,490) | $ (83,179) | $ (75,490) |  | $ (83,179) |  |  |
[1] | (4) Net of taxes of $199 and $(187) for the pension plans and postretirement benefits and unrealized gain (loss) on derivatives, respectively.
[2] | (3) Net of taxes of $39 and $5 for the pension plans and postretirement benefits and unrealized gain (loss) on derivatives, respectively.
[3] | (1) Net of taxes of $8,961 and $9,160 as of June 30, 2017 and December 31, 2016, respectively. Net of taxes of $9,840 and $9,879 as of June 30, 2016 and December 31, 2015, respectively.
[4] | (2) Net of taxes of $187 and $0 as of June 30, 2017 and December 31, 2016, respectively. Net of taxes of $0 and $5 as of June 30, 2016 and December 31, 2015, 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 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=66004921&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=66004124&loc=SL7669686-108580 + Details
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