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