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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 37,154,000 $ 31,464,000  
Provision for income taxes $ 7,956,000 $ 10,942,000  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 21.40% 34.80%  
Foreign Income Tax Expense (Benefit), Continuing Operations     $ 21,994,000