Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Before Tax
Balance at beginning of period		$ 661	$ 6,712	$ 6,712
Other comprehensive income (loss):
Unrealized holding gains arising during the period		19,551	7,648
Less: Reclassification adjustment for gains included in net income	[1]	(478)	(649)
Net unrealized gains on investments		19,073	6,999
Other comprehensive income		19,073	6,999
Balance at end of period		19,734	13,711	661
Tax Effect
Balance at beginning of period		(760)	(2,045)	(2,045)
Other comprehensive income (loss):
Unrealized holding gains arising during the period		(5,845)	(2,337)
Less: Reclassification adjustment for gains included in net income	[1]	131	227
Net unrealized gains on investments		(5,714)	(2,110)
Other comprehensive income		(5,714)	(2,110)
Balance at end of period		(6,474)	(4,155)	(760)
Net of Tax
Balance at beginning of period		(99)	4,667	4,667
Other comprehensive income (loss):
Unrealized holding gains arising during the period		13,706	5,311
Less: Reclassification adjustment for gains included in net income	[1]	(347)	(422)
Net unrealized gains on investments		13,359	4,889
Total other comprehensive income		13,359	4,889	(4,766)
Balance at end of period		$ 13,260	$ 9,556	$ (99)

[1] Included in net realized investment gains on our condensed consolidated statements of comprehensive income.