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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | $ (24,400) |  | $ (11,300) |  |
Net unrealized gains (losses) arising during the period | 3,300 |  | (15,040) |  |
Less: Net realized gains reclassified to net income | (3,770) |  | (1,940) |  |
Other Comprehensive Income (Loss) | 7,070 |  | (13,100) |  | $ (13,210)
Balance, at end of year | (17,330) |  | (24,400) |  | (11,300)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 1,670 |  | 250 |  | 1,810
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (650) |  | (730) |  | (2,650)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 6,050 |  | (12,620) |  | (12,370)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax | 300 |  | 300 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 1,300 |  | 700 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 300 |  | 700 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 1,900 |  | 300 |  |
Defined Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | (12,120) |  | (12,370) |  |
Net unrealized gains (losses) arising during the period | 1,000 | [1] | (1,270) | [2] |
Less: Net realized gains reclassified to net income | (670) | [3] | (1,520) | [4] |
Balance, at end of year | (10,450) |  | (12,120) |  | (12,370)
Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | (2,520) |  | (1,790) |  |
Net unrealized gains (losses) arising during the period | (3,750) | [1] | (1,150) | [2] |
Less: Net realized gains reclassified to net income | (3,100) | [3] | (420) | [4] |
Balance, at end of year | (3,170) |  | (2,520) |  | (1,790)
Foreign Currency Translation |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | (9,760) |  | 2,860 |  |
Net unrealized gains (losses) arising during the period | 6,050 |  | (12,620) |  |
Less: Net realized gains reclassified to net income | 0 |  | 0 |  |
Balance, at end of year | $ (3,710) |  | $ (9,760) |  | $ 2,860
[1] | Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.3 million. See Note 12, "Derivative Instruments," for further details.
[2] | Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.7 million. See Note 12, "Derivative Instruments," for further details.
[3] | Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.9 million. See Note 12, "Derivative Instruments," for further details
[4] | Defined benefit plans, net of income tax of $0.7 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 12, "Derivative Instruments," for further details.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: 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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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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