Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 3,734	$ 2,811	$ 26,350	$ 7,800
Other comprehensive income (loss):
Change in unrealized gains (losses) on investments, net of tax	(327)	(14)	(308)	110
Less: reclassification adjustment for net investment (gains) losses included in net income, net of tax	2	(79)	(16)	(81)
Total other comprehensive income (loss)	(325)	(93)	(324)	29
Comprehensive income	$ 3,409	$ 2,718	$ 26,026	$ 7,829