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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 |  |

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