Income Taxes Other information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax (Textual) [Abstract]
Income taxes paid	$ 200	$ 100	$ 200
Decrease in deferred tax asset valuation allowance	1,100	200	800
Operating Loss Carryforwards [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	800	1,300
Goodwill	5,520	319	0
Income Tax Expense (Benefit)	500
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	3,136	2,964
Additions for tax positions of current year	544	146
Additions for tax positions of prior years	116	26
Reductions for tax positions of prior years	(547)	0
Balance at end of year	3,249	$ 3,136	$ 2,964
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	37,500
Foreign
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	500
US Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 46,700