Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Income tax expense	$ (1,418)	$ 1,136	$ 332	$ 3,533
Effective income tax rate	(6.60%)		0.70%		7.00%
Income Tax Expense (Benefit), before discrete items	$ 1,600		$ 2,700
Effective Income Tax Rate Reconciliation, Excluding Discrete Items, Percent	7.50%		5.80%
Unrecognized Tax Benefits	$ 3,165		$ 3,165			$ 3,115
Unrecognized tax benefits, period increase (decrease)			$ 50	$ 108
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%