Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Tax expense on net unrealized gains arising during the period	$ 2,015	$ (9,694)	$ 26,294
Tax benefit of amortization of net unrealized holding gains to income	$ 1,523	$ 1,950	$ 3,567