Income Taxes - Net Deferred Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Taxes on Income and Uncertain Tax Positions [Abstract]
Deferred Tax Assets Net Noncurrent	$ 24,382	$ 30,107
Non-current deferred tax liabilities	12,008	10,258
Deferred Tax Assets, Net, Total	$ 12,374	$ 19,849