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Shareholders' Equity Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of accumulated other comprehensive income (loss), 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 Plan Benefit Liability Adjustments
 
Accumulated Other Comprehensive Income (Loss)
 
(in thousands)
Balances at January 1, 2013
$
(3,722
)
 
$
(1,689
)
 
$
(14,380
)
 
$
(15,002
)
 
$
(34,793
)
OCI before reclassifications
7,939

 
2

 
—

 
3,738

 
11,679

Amounts reclassified from AOCI
—

 
431

 
—

 
1,379

 
1,810

Current period other comprehensive income (loss)
7,939

 
433


—


5,117

 
13,489

Balances at December 31, 2013
$
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

Current period 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

Current period 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
)
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 other comprehensive income (loss) during the reporting periods were as follows:

 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
Before-tax amount
 
Foreign currency translation adjustment
$
(74,219
)
 
$
(89,329
)
 
$
8,953

Foreign currency translation adjustment reclassified into net income on disposal
962

 
—

 
—

Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
123

 
(915
)
 
(3
)
Net hedging (gain) loss reclassified into net income (loss)
1,639

 
1,704

 
697

Pension plan benefits liability adjustment
8,971

 
(25,270
)
 
7,344

Total other comprehensive income (loss), before tax
(62,524
)
 
(113,810
)
 
16,991

 
 
 
 
 
 
Tax (provision) benefit
 
 
 
 
 
Foreign currency translation adjustment
328

 
32

 
(1,014
)
Foreign currency translation adjustment reclassified into net income on disposal
—

 
—

 
—

Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
(47
)
 
349

 
5

Net hedging (gain) loss reclassified into net income (loss)
(629
)
 
(650
)
 
(266
)
Pension plan benefits liability adjustment
(2,675
)
 
323

 
(2,227
)
Total other comprehensive income (loss) tax (provision) benefit
(3,023
)
 
54

 
(3,502
)
 
 
 
 
 
 
Net-of-tax amount
 
 
 
 
 
Foreign currency translation adjustment
(73,891
)
 
(89,297
)
 
7,939

Foreign currency translation adjustment reclassified into net income on disposal
962

 
—

 
—

Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
76

 
(566
)
 
2

Net hedging (gain) loss reclassified into net income (loss)
1,010

 
1,054

 
431

Pension plan benefits liability adjustment
6,296

 
(24,947
)
 
5,117

Total other comprehensive income (loss), net of tax
$
(65,547
)
 
$
(113,756
)
 
$
13,489
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
 
 
2015
 
2014
 
2013
 
 
 
 
(in thousands)
 
 
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
Prior-service costs
 
$
(59
)
 
$
(138
)
 
$
(70
)
 
(2) 
Actuarial losses
 
(1,979
)
 
(572
)
 
(926
)
 
(2) 
Loss on settlement
 
(375
)
 
(55
)
 
(325
)
 
(2) 
Other
 
(46
)
 
—

 
(658
)
 
(2) 
Total, before tax
 
(2,459
)
 
(765
)
 
(1,979
)
 
Income before income taxes
Tax benefit
 
733

 
10

 
600

 
Income tax provision
Total, net of tax
 
(1,726
)
 
(755
)
 
(1,379
)
 
Net income
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of tax
 
$
(1,726
)
 
$
(755
)
 
$
(1,379
)
 
Net income

(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.