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Operations and Summary of Significant Accounting Policies - Comprehensive Income (Loss) - (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) bank | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting Policies [Abstract] |  |  |
Number of banks where demand deposit or money market accounts are held by the company | bank | 17 |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | $ (32,970) | $ (28,576) | $ (7,180)
Other Comprehensive Income (Loss), Net of Tax | 20,329 | (4,394) | (21,165)
Amounts reclassified from accumulative other comprehensive income, net of tax | 0 |  | 231
Balance, end of period | (12,496) | (32,970) | (28,576)
Reclassification from AOCI, tax expense (benefit) | 0 |  | 0
Foreign currency translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (31,472) | (27,552) | (6,613)
Other Comprehensive Income (Loss), Net of Tax | 21,273 | (3,920) | (20,708)
Amounts reclassified from accumulative other comprehensive income, net of tax |  |  | 231
Balance, end of period | (10,054) | (31,472) | (27,552)
Other comprehensive income (loss) before reclassification, tax expense (benefit) | 0 | 222 | 57
Pension benefit |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (1,498) | (1,024) | (567)
Other Comprehensive Income (Loss), Net of Tax | (944) | (474) | (457)
Amounts reclassified from accumulative other comprehensive income, net of tax | 0 |  |
Balance, end of period | (2,442) | (1,498) | (1,024)
Other comprehensive income (loss) before reclassification, tax expense (benefit) | $ (36) | $ (87) | $ (82)

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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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