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Shareholders' Equity Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
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
)