Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 789	$ 1,877	$ 1,121	$ 5,410
Effective income tax rate	3.20%		1.60%		6.00%
Income Tax Expense (Benefit), before discrete items	$ (139)		$ (2,800)
Effective Income Tax Rate Reconciliation, Excluding Discrete Items, Percent	0.00%		4.00%
Unrecognized Tax Benefits	$ 3,815		$ 3,815
Unrecognized tax benefits, period increase (decrease)			$ 700	$ 594
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%