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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Provision for income taxes $ 58,514 $ 2,808  
Effective tax rate (as a percent) 12.50% 11.80%  
Current income taxes receivable $ 103,600   $ 115,200
Current taxes payable 52,600   7,600
Deferred tax asset, alternative minimum tax 600   600
Operating loss carryforwards 231,800   231,800
Deferred tax asset, non-U.S. operating loss carryforward $ 43,500   43,500
Tax cuts and jobs act, incomplete accounting change in rate, provisional income tax expense     $ 90,600