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Shareholders' Equity Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Comprehensive Income (Loss) [Abstract] |
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, 2015 | $ | (85,080 | ) |  | $ | (768 | ) |  | $ | (14,380 | ) |  | $ | (34,832 | ) |  | $ | (135,060 | )
OCI before reclassifications | (73,891 | ) |  | 76 |  |  | — |  |  | 4,570 |  |  | (69,245 | )
Amounts reclassified from AOCI | 962 |  |  | 1,010 |  |  | — |  |  | 1,726 |  |  | 3,698 |
Total other comprehensive income (loss) | (72,929 | ) |  | 1,086 |  |  | — |  |  | 6,296 |  |  | (65,547 | )
Balances at December 31, 2015 | $ | (158,009 | ) |  | $ | 318 |  |  | $ | (14,380 | ) |  | $ | (28,536 | ) |  | $ | (200,607 | )
OCI before reclassifications | (23,570 | ) |  | (1,087 | ) |  | — |  |  | (6,191 | ) |  | (30,848 | )
Amounts reclassified from AOCI | (1,407 | ) |  | 812 |  |  | — |  |  | 2,723 |  |  | 2,128 |
Total other comprehensive income (loss) | (24,977 | ) |  | (275 | ) |  | — |  |  | (3,468 | ) |  | (28,720 | )
Balances at December 31, 2016 | $ | (182,986 | ) |  | $ | 43 |  |  | $ | (14,380 | ) |  | $ | (32,004 | ) |  | $ | (229,327 | )
OCI before reclassifications | 53,854 |  |  | 360 |  |  | — |  |  | 2,354 |  |  | 56,568 |
Amounts reclassified from AOCI | 484 |  |  | 563 |  |  | — |  |  | 1,234 |  |  | 2,281 |
Total other comprehensive income (loss) | 54,338 |  |  | 923 |  |  | — |  |  | 3,588 |  |  | 58,849 |
Balances at December 31, 2017 | $ | (128,648 | ) |  | $ | 966 |  |  | $ | (14,380 | ) |  | $ | (28,416 | ) |  | $ | (170,478 | )
Income Tax (Provision) Benefit Related To OCI [Table Text Block] | The before-tax, income tax (provision) benefit, and net-of-tax amounts related to each component of OCI during the reporting periods were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Before-tax amount |
Foreign currency translation adjustment | $ | 54,218 |  |  | $ | (23,280 | ) |  | $ | (74,219 | )
Foreign currency translation adjustment reclassified into net income on disposal | 484 |  |  | (1,407 | ) |  | 962 |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 585 |  |  | (1,768 | ) |  | 123 |
Net hedging (gain) loss reclassified to net income | 916 |  |  | 1,322 |  |  | 1,639 |
Net unrealized gain (loss) on defined benefit plans | 3,401 |  |  | (6,256 | ) |  | 6,512 |
Net defined benefit plan loss reclassified to net income | 1,782 |  |  | 2,752 |  |  | 2,459 |
Total other comprehensive income (loss), before tax | 61,386 |  |  | (28,637 | ) |  | (62,524 | )
Tax (provision) benefit |  |  |  |  |
Foreign currency translation adjustment | (364 | ) |  | (290 | ) |  | 328 |
Foreign currency translation adjustment reclassified into net income on disposal | — |  |  | — |  |  | — |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (225 | ) |  | 681 |  |  | (47 | )
Net hedging (gain) loss reclassified into net income | (353 | ) |  | (510 | ) |  | (629 | )
Net unrealized gain (loss) on defined benefit plans | (1,047 | ) |  | 65 |  |  | (1,942 | )
Net defined benefit plan loss reclassified to net income | (548 | ) |  | (29 | ) |  | (733 | )
Total other comprehensive income (loss) tax (provision) benefit | (2,537 | ) |  | (83 | ) |  | (3,023 | )
Net-of-tax amount |  |  |  |  |
Foreign currency translation adjustment | 53,854 |  |  | (23,570 | ) |  | (73,891 | )
Foreign currency translation adjustment reclassified into net income on disposal | 484 |  |  | (1,407 | ) |  | 962 |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 360 |  |  | (1,087 | ) |  | 76 |
Net hedging (gain) loss reclassified into net income | 563 |  |  | 812 |  |  | 1,010 |
Net unrealized gain (loss) on defined benefit plans | 2,354 |  |  | (6,191 | ) |  | 4,570 |
Net defined benefit plan loss reclassified to net income | 1,234 |  |  | 2,723 |  |  | 1,726 |
Total other comprehensive income (loss), net of tax | $ | 58,849 |  |  | $ | (28,720 | ) |  | $ | (65,547 | )

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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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