CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net unrealized change in investments, tax	$ (861)	$ 923	$ 0
Accumulated Other Comprehensive Income (Loss)
Net unrealized change in investments, tax	$ (861)	$ 923	$ 0