Income Taxes Components of the provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of the provision for income taxes [Line Items]
Current tax provision	$ 1,467	$ 1,838	$ 2,010
Deferred tax provision (benefit)	566	341	(37)
Provision for income taxes	$ 2,033	$ 2,179	$ 1,973