Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance at the beginning of the period	$ 4,064	$ 4,465
Additions for tax positions related to the current year	1,395	940
Reductions of tax positions of prior years	(343)	(1,341)
Balance at the end of the period	5,116	4,064
Unrecognized tax benefits, if recognized, would not impact the company's effective tax rate	$ 4,900	$ 3,900