CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 3,713	$ 14,658	$ 9,185	$ 2,829	$ 4,042	$ 2,408	$ 5,259	$ 3,811	$ 30,385	$ 15,520	$ 21,639
Other comprehensive income
Holding gains (losses) on available for sale investments, net of income tax									(97)	10	119
Comprehensive income									$ 30,288	$ 15,530	$ 21,758