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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) 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, 2016
$
(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
)
OCI before reclassifications
(28,841
)
 
2,586

 
—

 
1,653

 
(24,602
)
Amounts reclassified from AOCI
—

 
(2,351
)
 
—

 
1,126

 
(1,225
)
Total other comprehensive income (loss)
(28,841
)
 
235

 
—

 
2,779

 
(25,827
)
Balances at December 31, 2018
$
(157,489
)
 
$
1,201

 
$
(14,380
)
 
$
(25,637
)
 
$
(196,305
)
Income Tax (Provision) Benefit Related To OCI 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,
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
(in thousands)
Before-tax amount
 
Foreign currency translation adjustment
$
(29,130
)
 
$
54,218

 
$
(23,280
)
Foreign currency translation adjustment reclassified into net income on disposal
—

 
484

 
(1,407
)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
2,908

 
585

 
(1,768
)
Net hedging (gain) loss reclassified to net income
(2,507
)
 
916

 
1,322

Net unrealized gain (loss) on defined benefit plans
2,343

 
3,401

 
(6,256
)
Net defined benefit plan loss reclassified to net income
1,596

 
1,782

 
2,752

Total other comprehensive income (loss), before tax
(24,790
)
 
61,386

 
(28,637
)
 
 
 
 
 
 
Tax (provision) benefit
 
 
 
 
 
Foreign currency translation adjustment
289

 
(364
)
 
(290
)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
(322
)
 
(225
)
 
681

Net hedging (gain) loss reclassified into net income
156

 
(353
)
 
(510
)
Net unrealized gain (loss) on defined benefit plans
(690
)
 
(1,047
)
 
65

Net defined benefit plan loss reclassified to net income
(470
)
 
(548
)
 
(29
)
Total other comprehensive income (loss) tax (provision) benefit
(1,037
)
 
(2,537
)
 
(83
)
 
 
 
 
 
 
Net-of-tax amount
 
 
 
 
 
Foreign currency translation adjustment
(28,841
)
 
53,854

 
(23,570
)
Foreign currency translation adjustment reclassified into net income on disposal
—

 
484

 
(1,407
)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges
2,586

 
360

 
(1,087
)
Net hedging (gain) loss reclassified into net income
(2,351
)
 
563

 
812

Net unrealized gain (loss) on defined benefit plans
1,653

 
2,354

 
(6,191
)
Net defined benefit plan loss reclassified to net income
1,126

 
1,234

 
2,723

Total other comprehensive income (loss), net of tax
$
(25,827
)
 
$
58,849

 
$
(28,720
)