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