Basis of Presentation (Details) Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax
Net unrealized appreciation on available-for-sale investments	$ 6,221	$ 4,681
Foreign currency translation	(5,629)	(5,640)
Accumulated other comprehensive income (loss)	592	(959)
Deferred income tax liability	469
Deferred income tax asset		$ 516