Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurements [Abstract]

Available-for-sale securities measured at fair value

	Fair Value Measurements Using
	(Level 1)		(Level 2)		(Level 3)		Total
As of March 31, 2013
Cash and cash equivalents	$	279,327		—		—		279,327
Fixed-maturity securities:
U.S. Treasury and U.S. government agencies		582		1,176		—		1,758
Corporate bonds		11,117		—		—		11,117
Commercial mortgage-backed securities		—		10,741		—		10,741
State, municipalities, and political subdivisions		10,664		—		—		10,664
Redeemable preferred stock		837		—		—		837
Total fixed-maturity securities		23,200		11,917		—		35,117
Equity securities		9,944		—		—		9,944
Total available-for-sale securities		33,144		11,917		—		45,061
Total	$	312,471		11,917		—		324,388
Long-term debt	$	43,470		—		—		43,470

	Fair Value Measurements Using
	(Level 1)		(Level 2)		(Level 3)		Total
As of December 31, 2012
Cash and cash equivalents	$	230,214		—		—		230,214
Fixed-maturity securities:
U.S. Treasury and U.S. government agencies		583		864		—		1,447
Corporate bonds		10,860		—		—		10,860
Commercial mortgage-backed securities		—		11,644		—		11,644
State, municipalities, and political subdivisions		11,066		—		—		11,066
Redeemable preferred stock		936		—		—		936
Total fixed-maturity securities		23,445		12,508		—		35,953
Equity securities		8,876		—		—		8,876
Total available-for-sale securities		32,321		12,508		—		44,829
Total	$	262,535		12,508		—		275,043