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Shareholders' Equity Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Before-tax amount |  |  |  |  |  |  |
Foreign currency translation adjustment | $ | 20,520 |  |  | $ | (6,730 | ) |  | $ | 35,586 |  |  | $ | 3,728 |
Foreign currency translation adjustment reclassified into net income | — |  |  | (1,407 | ) |  | — |  |  | (1,407 | )
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (634 | ) |  | (2,128 | ) |  | (537 | ) |  | (6,641 | )
Net hedging loss reclassified into net income | 259 |  |  | 280 |  |  | 637 |  |  | 566 |
Net defined benefit plan gain (loss) reclassified to net income | 418 |  |  | (340 | ) |  | 824 |  |  | (795 | )
Total other comprehensive income (loss), before tax | 20,563 |  |  | (10,325 | ) |  | 36,510 |  |  | (4,549 | )
Tax (provision) benefit |  |  |  |  |  |  |
Foreign currency translation adjustment | (73 | ) |  | (243 | ) |  | (123 | ) |  | (595 | )
Foreign currency translation adjustment reclassified into net income | — |  |  | — |  |  | — |  |  | — |
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 244 |  |  | 830 |  |  | 207 |  |  | 2,561 |
Net hedging loss reclassified into net income | (100 | ) |  | (108 | ) |  | (246 | ) |  | (218 | )
Net defined benefit plan gain (loss) reclassified to net income | (225 | ) |  | 49 |  |  | (230 | ) |  | 186 |
Total other comprehensive income (loss) tax benefit | (154 | ) |  | 528 |  |  | (392 | ) |  | 1,934 |
Net-of-tax amount |  |  |  |  |  |  |
Foreign currency translation adjustment | 20,447 |  |  | (6,973 | ) |  | 35,463 |  |  | 3,133 |
Foreign currency translation adjustment reclassified into net income | — |  |  | (1,407 | ) |  | — |  |  | (1,407 | )
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (390 | ) |  | (1,298 | ) |  | (330 | ) |  | (4,080 | )
Net hedging loss reclassified into net income | 159 |  |  | 172 |  |  | 391 |  |  | 348 |
Net defined benefit plan gain (loss) reclassified to net income | 193 |  |  | (291 | ) |  | 594 |  |  | (609 | )
Total other comprehensive income (loss), net of tax | $ | 20,409 |  |  | $ | (9,797 | ) |  | $ | 36,118 |  |  | $ | (2,615 | )
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 |  | Total
| (in thousands)
Balances at January 1, 2016 | $ | (158,009 | ) |  | $ | 318 |  |  | $ | (14,380 | ) |  | $ | (28,536 | ) |  | $ | (200,607 | )
OCI before reclassifications | 3,133 |  |  | (4,080 | ) |  | — |  |  | (87 | ) |  | (1,034 | )
Amounts reclassified from AOCI | (1,407 | ) |  | 348 |  |  | — |  |  | (522 | ) |  | (1,581 | )
Total other comprehensive income (loss) | 1,726 |  |  | (3,732 | ) |  | — |  |  | (609 | ) |  | (2,615 | )
Balances at June 30, 2016 | $ | (156,283 | ) |  | $ | (3,414 | ) |  | $ | (14,380 | ) |  | $ | (29,145 | ) |  | $ | (203,222 | )
Balances at January 1, 2017 | $ | (182,986 | ) |  | $ | 43 |  |  | $ | (14,380 | ) |  | $ | (32,004 | ) |  | $ | (229,327 | )
OCI before reclassifications | 35,463 |  |  | (330 | ) |  | — |  |  | — |  |  | 35,133 |
Amounts reclassified from AOCI | — |  |  | 391 |  |  | — |  |  | 594 |  |  | 985 |
Total other comprehensive income (loss) | 35,463 |  |  | 61 |  |  | — |  |  | 594 |  |  | 36,118 |
Balances at June 30, 2017 | $ | (147,523 | ) |  | $ | 104 |  |  | $ | (14,380 | ) |  | $ | (31,410 | ) |  | $ | (193,209 | )

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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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