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Shareholders' Equity Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2014 | $ | 4,217 |  |  | $ | (1,256 | ) |  | $ | (14,380 | ) |  | $ | (9,885 | ) |  | $ | (21,304 | )
OCI before reclassifications | (89,297 | ) |  | (566 | ) |  | — |  |  | (25,702 | ) |  | (115,565 | )
Amounts reclassified from AOCI | — |  |  | 1,054 |  |  | — |  |  | 755 |  |  | 1,809 |
Total other comprehensive income (loss) | (89,297 | ) |  | 488 |  |  | — |  |  | (24,947 | ) |  | (113,756 | )
Balances at December 31, 2014 | $ | (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 | )
Income Tax (Provision) Benefit Related To OCI [Table Text Block] | The before-tax amount, income tax (provision) benefit, and net-of-tax amount related to each component of OCI during the reporting periods were as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands)
Before-tax amount |
Foreign currency translation adjustment | $ | (23,280 | ) |  | $ | (74,219 | ) |  | $ | (89,329 | )
Foreign currency translation adjustment reclassified into net income on disposal | (1,407 | ) |  | 962 |  |  | — |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (1,768 | ) |  | 123 |  |  | (915 | )
Net hedging (gain) loss reclassified into net income (loss) | 1,322 |  |  | 1,639 |  |  | 1,704 |
Pension benefit obligation adjustment | (3,504 | ) |  | 8,971 |  |  | (25,270 | )
Total other comprehensive income (loss), before tax | (28,637 | ) |  | (62,524 | ) |  | (113,810 | )
Tax (provision) benefit |  |  |  |  |
Foreign currency translation adjustment | (290 | ) |  | 328 |  |  | 32 |
Foreign currency translation adjustment reclassified into net income on disposal | — |  |  | — |  |  | — |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 681 |  |  | (47 | ) |  | 349 |
Net hedging (gain) loss reclassified into net income (loss) | (510 | ) |  | (629 | ) |  | (650 | )
Pension benefit obligation adjustment | 36 |  |  | (2,675 | ) |  | 323 |
Total other comprehensive income (loss) tax (provision) benefit | (83 | ) |  | (3,023 | ) |  | 54 |
Net-of-tax amount |  |  |  |  |
Foreign currency translation adjustment | (23,570 | ) |  | (73,891 | ) |  | (89,297 | )
Foreign currency translation adjustment reclassified into net income on disposal | (1,407 | ) |  | 962 |  |  | — |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (1,087 | ) |  | 76 |  |  | (566 | )
Net hedging (gain) loss reclassified into net income (loss) | 812 |  |  | 1,010 |  |  | 1,054 |
Pension benefit obligation adjustment | (3,468 | ) |  | 6,296 |  |  | (24,947 | )
Total other comprehensive income (loss), net of tax | $ | (28,720 | ) |  | $ | (65,547 | ) |  | $ | (113,756 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | Details about the AOCI components reclassified to the Consolidated Statements of Operations during the reporting periods are as follows:
|  | Amount Reclassified from AOCI(1) |  |
|  | Year Ended December 31, |  | Affected Line Item in the Income Statement
|  | 2016 |  | 2015 |  | 2014 |  |
|  | (in thousands) |  |
Amortization of defined benefit pension items |  |  |  |  |  |  |  |
Prior-service costs |  | $ | (58 | ) |  | $ | (59 | ) |  | $ | (138 | ) |  | (2)
Actuarial losses |  | (1,351 | ) |  | (1,979 | ) |  | (572 | ) |  | (2)
Loss on settlement |  | (1,343 | ) |  | (375 | ) |  | (55 | ) |  | (2)
Other |  | — |  |  | (46 | ) |  | — |  |  | (2)
Total, before tax |  | (2,752 | ) |  | (2,459 | ) |  | (765 | ) |  | Income (loss) before income taxes
Tax benefit |  | 29 |  |  | 733 |  |  | 10 |  |  | Income tax provision
Total, net of tax |  | $ | (2,723 | ) |  | $ | (1,726 | ) |  | $ | (755 | ) |  | Net income (loss)
(1) | Amounts in parenthesis indicate debits to the Consolidated Statements of Operations.
(2) | These AOCI components are included in the computation of net periodic pension cost. Refer to Note 8 for additional details.

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- Definition Other Comprehensive Income (Loss) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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=66004124&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=66004124&loc=d3e526-108580 + Details
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