Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Line Items]
Effective combined Federal and state tax rate	(2.00%)	5.90%
Statutory federal tax rate (as a percent)	21.00%
Income Tax Expense (Benefit)	$ (973)	$ 1,652
Release of valuation allowance	8,200
Deferred Tax Asset Investment In Subsidiary [Member]
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	(8,200)
Release of valuation allowance	(8,200)
Valuation allowance	19,400
Deferred Tax Asset Foreign Tax Credits [Member]
Income Tax Disclosure [Line Items]
Valuation allowance	1,800
Deferred Tax Asset Foreign Net Operating Loss [Member]
Income Tax Disclosure [Line Items]
Valuation allowance	$ 600