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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |
Current year and prior year earnings of Company's foreign operations | $ 159,200 |  |
Foreign withholding taxes | 4,100 |  |
Federal tax benefit attributable to adjustments discovered | 2,200 |  |
State tax charge | $ 3,300 |  |
Estimated effective tax rate on continuing operations | 29.40% | 32.50% |
Increase decrease in unrecognized tax benefits |  |  | $ 2,200
Discrete tax benefit | $ 2,200 |  |
Valuation allowance | $ 1,300 |  |
Earliest Tax Year [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Open tax years | 2007 |  |
Latest Tax Year [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Open tax years | 2019 |  |

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