Income Taxes - Net Deferred Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Taxes on Income and Uncertain Tax Positions [Abstract]
Deferred Tax Assets Net Noncurrent	$ 6,946	$ 15,460
Non-current deferred tax liabilities	10,003	9,653
Deferred Tax (Liability) Asset Net	$ (3,057)	$ 5,807

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant