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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |
Current year and prior year earnings of Company's foreign operations |  |  | $ 153,200 |  |
Foreign withholding taxes |  |  | 3,900 |  |
Federal tax benefit attributable to adjustments discovered |  |  | 2,200 |  |
State tax charge |  |  | $ 3,200 |  |
Estimated effective tax rate on continuing operations |  |  | 28.40% | 30.10% |
Increase decrease in unrecognized tax benefits |  |  |  |  | $ 22
Discrete tax benefit |  |  | $ 2,200 |  |
Increase decrease in income tax expense |  | $ 5,000 |  |  |
Non-U.S. subsidiary [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Valuation allowance | $ 800 |  |  |  |
German tax [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
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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