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Income Tax (Tables)
 3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
for the three months ended March 31, 2018 and 2017, respectively (dollars in thousands):
 
 
Three months ended March 31,
 
 
2018
 
2017
Tax provision at U.S. statutory rate
 
$
28,964

 
$
72,745

Increase (decrease) in income taxes resulting from:
 
 
 
 
U.S. Tax Reform provisional adjustments
 
775

 
—

Foreign tax rate differing from U.S. tax rate
 
1,432

 
(6,153
)
Differences in tax bases in foreign jurisdictions
 
(5,760
)
 
(3,383
)
Deferred tax valuation allowance
 
7,947

 
1,182

Amounts related to tax audit contingencies
 
835

 
611

Corporate rate changes
 
111

 
(1,237
)
Subpart F
 
658

 
186

Foreign tax credits
 
(572
)
 
(126
)
Global intangible low-taxed income, net of credit
 
4,409

 
—

Return to provision adjustments
 
—

 
229

Equity compensation excess benefit
 
(1,114
)
 
(1,856
)
Other, net
 
10

 
134

Total provision for income taxes
 
$
37,695

 
$
62,332

Effective tax rate
 
27.3
%
 
30.0
%