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Shareholders' Equity Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
Total Comprehensive Income (Loss) [Table Text Block] | The before-tax amount, income tax (provision) benefit, and net-of-tax amount related to each component of OCI were as follows:
| Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Before-tax amount |  |  |
Foreign currency translation adjustment | $ | 16,293 |  |  | $ | 15,066 |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 1,436 |  |  | 97 |
Net hedging (gain) loss reclassified into net income | (19 | ) |  | 378 |
Net defined benefit plan loss reclassified to net income | 420 |  |  | 406 |
Total other comprehensive income (loss), before tax | 18,130 |  |  | 15,947 |
Tax (provision) benefit |  |  |
Foreign currency translation adjustment | 7 |  |  | (50 | )
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (253 | ) |  | (37 | )
Net hedging (gain) loss reclassified into net income | 5 |  |  | (146 | )
Net defined benefit plan loss reclassified to net income | (6 | ) |  | (5 | )
Total other comprehensive income (loss) tax benefit | (247 | ) |  | (238 | )
Net-of-tax amount |  |  |
Foreign currency translation adjustment | 16,300 |  |  | 15,016 |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 1,183 |  |  | 60 |
Net hedging (gain) loss reclassified into net income | (14 | ) |  | 232 |
Net defined benefit plan loss reclassified to net income | 414 |  |  | 401 |
Total other comprehensive income (loss), net of tax | $ | 17,883 |  |  | $ | 15,709 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The changes in the components of AOCI, net of tax, were as follows:
| Foreign Currency Translation Adjustments |  | Net Unrealized Gain (Loss) on Derivative Instruments |  | Net Unrealized Gain (Loss) on Nonderivative Instruments |  | Pension Benefit Obligation Adjustments |  | Accumulated Other Comprehensive Income (Loss)
| (in thousands)
Balances at January 1, 2017 | $ | (182,986 | ) |  | $ | 43 |  |  | $ | (14,380 | ) |  | $ | (32,004 | ) |  | $ | (229,327 | )
OCI before reclassifications | 15,016 |  |  | 60 |  |  | — |  |  | — |  |  | 15,076 |
Amounts reclassified from AOCI | — |  |  | 232 |  |  | — |  |  | 401 |  |  | 633 |
Total other comprehensive income (loss) | 15,016 |  |  | 292 |  |  | — |  |  | 401 |  |  | 15,709 |
Balances at March 31, 2017 | $ | (167,970 | ) |  | $ | 335 |  |  | $ | (14,380 | ) |  | $ | (31,603 | ) |  | $ | (213,618 | )
Balances at January 1, 2018 | $ | (128,648 | ) |  | $ | 966 |  |  | $ | (14,380 | ) |  | $ | (28,416 | ) |  | $ | (170,478 | )
OCI before reclassifications | 16,300 |  |  | 1,183 |  |  | — |  |  | — |  |  | 17,483 |
Amounts reclassified from AOCI | — |  |  | (14 | ) |  | — |  |  | 414 |  |  | 400 |
Total other comprehensive income (loss) | 16,300 |  |  | 1,169 |  |  | — |  |  | 414 |  |  | 17,883 |
Balances at March 31, 2018 | $ | (112,348 | ) |  | $ | 2,135 |  |  | $ | (14,380 | ) |  | $ | (28,002 | ) |  | $ | (152,595 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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 Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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