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Significant Accounting Policies (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Significant Accounting Policies [Line Items]          
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ (10,981,000) $ 29,611,000 $ (39,960,000) $ 41,503,000  
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)         $ (26,674,000)
Goodwill 843,180,000   $ 843,180,000   835,935,000
Effective Income Tax Rate Reconciliation, Percent     8.40% 42.50%  
Income Tax Expense (Benefit), Change       $ 21,026,000  
Unrecognized Tax Benefits 1,198,000   $ 1,198,000   1,556,000
Redeemable noncontrolling interest, redemptions, value     (9,791,000)   (910,000)
Beginning Balance     62,886,000 $ 60,180,000 60,180,000
Granted     0   1,666,000
Redeemable noncontrolling interest, changes in redemption value     4,409,000   1,498,000
Currency translation adjustments     (311,000)   452,000
Ending Balance $ 57,193,000   $ 57,193,000   $ 62,886,000
Foreign Tax Authority [Member]          
Significant Accounting Policies [Line Items]          
Effective Income Tax Rate Reconciliation, Percent     26.30%    
Minimum [Member]          
Significant Accounting Policies [Line Items]          
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions     $ 400,000    
Maximum [Member]          
Significant Accounting Policies [Line Items]          
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions     $ 500,000