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Income Taxes (Textuals) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | $ 32,100,000 |
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense |  | 4,500,000 |
Transition Tax obligation |  | 2,800,000 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 4,300,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 0 |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) |  |  | $ 4,100,000
Decrease in current income tax payable |  |  | (1,400,000)
Increase (decrease) in deferred tax liabilities |  | (100,000) | 900,000
Cumulative Effect on Retained Earnings, Net of Tax |  | (6,200,000) |
Tax effected in state net operating loss carryforwards |  | 600,000 | 800,000
Tax effected in foreign net operating loss carryforwards |  | 12,600,000 | $ 19,800,000
Valuation allowance related to federal capital loss carryforwards |  | 9,000,000 |
Undistributed earnings of foreign subsidiaries |  | $ 27,100,000 |
Accounting Standards Update 2018-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 22,700,000 |  |
Accounting Standards Update 2016-16 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (5,100,000) |  |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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