Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 8,664	$ 9,604	$ 21,029	$ 20,466
Other comprehensive income (loss), net of taxes:
Unrealized holding gains (losses)	(11,407)	(6,975)	(154)	13,075
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(3)	(4)	(4)	(539)
Recognition of previously unrealized holding gains	(1,881)	(1,450)	(5,652)	(3,231)
Unrealized foreign currency translation gains (losses)	66	9	34	(38)
Other comprehensive income (loss), net of taxes	(13,225)	(8,420)	(5,776)	9,267
Comprehensive income (loss), net of taxes	$ (4,561)	$ 1,184	$ 15,253	$ 29,733