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