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Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Total Current $ 266,851 $ 212,855 $ 188,137
Total Deferred (296,265) (153,649) (149,241)
Provision for income taxes (29,414) 59,206 38,896
Italy      
Income Tax Contingency [Line Items]      
Foreign 131,155 192,712 168,915
Foreign 865 (5,837) 1,660
United States      
Income Tax Contingency [Line Items]      
Foreign 80,140 (16,982) (24,434)
Foreign (175,539) (109,139) (121,032)
United Kingdom      
Income Tax Contingency [Line Items]      
Domestic 733 711 (5,097)
Domestic 4,366 19,232 (16,242)
All other      
Income Tax Contingency [Line Items]      
Foreign 54,823 36,414 48,753
Foreign $ (125,957) $ (57,905) $ (13,627)