Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fixed income securities-available for sale
Fixed maturity securities - available for sale	$ 6,281,781	$ 5,718,834
Equity securities - available for sale, at fair value (cost: $275,827)	284,639	0
Held-to-maturity Securities, Fair Value	0	163,136
Short-term investments*	363,053	133,917
Other Investments	20,925	35,897
Restricted cash and securities	2,043
Premium, claims and other receivables	68,207
Other assets	349	1,516
Total assets measured at fair value	7,020,997	6,053,123
Notes payable	636,363	505,671
Accounts payable and accrued liabilities - earnout liability	9,052
Accounts payable and accrued liabilities - forward contract	3,194
Total liabilities measured at fair value	648,609
Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	174,520	201,582
Equity securities - available for sale, at fair value (cost: $275,827)	284,639
Short-term investments*	251,988	67,288
Other Investments Held At Fair Value	20,925	35,720
Total assets measured at fair value	732,072	304,590
Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	6,107,097	5,516,082
Held-to-maturity Securities, Fair Value		163,136
Short-term investments*	111,065	66,629
Restricted cash and securities	2,043
Premium, claims and other receivables	68,207
Total assets measured at fair value	6,288,412	5,745,847
Notes payable	636,363	505,671
Accounts payable and accrued liabilities - earnout liability	2,043
Accounts payable and accrued liabilities - forward contract	3,194
Total liabilities measured at fair value	641,600
Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	164	1,170
Other assets	349	1,516
Total assets measured at fair value	513	2,686
Accounts payable and accrued liabilities - earnout liability	7,009
Total liabilities measured at fair value	7,009
US Government Agencies Debt Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	199,607	295,679
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	174,520	201,582
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	25,087	94,097
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	1,065,811	1,085,341
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	1,065,811	1,085,341
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Special Purpose Revenue Bonds Of States Municipalities And Political Subdivisions [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	2,200,331	1,863,888
Special Purpose Revenue Bonds Of States Municipalities And Political Subdivisions [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Special Purpose Revenue Bonds Of States Municipalities And Political Subdivisions [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	2,200,331	1,863,888
Special Purpose Revenue Bonds Of States Municipalities And Political Subdivisions [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Corporate Debt Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	1,315,170	846,333
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	1,315,006	846,178
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	164	155
Residential Mortgage Backed Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	664,887	1,100,086
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	664,887	1,100,086
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Commercial Mortgage Backed Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	524,289	256,124
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	524,289	256,124
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Asset-backed Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	33,275	34,746
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	33,275	33,731
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	1,015
Foreign Government Debt Securities [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	278,411	236,637
Foreign Government Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	0	0
Foreign Government Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	278,411	236,637
Foreign Government Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fixed income securities-available for sale
Fixed maturity securities - available for sale	$ 0	$ 0

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