Investments - Additional Information (Details) (USD $)	3 Months Ended								3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 U.S. Treasury securities security	Dec. 31, 2013 U.S. Treasury securities	Mar. 31, 2014 U.S. Treasury securities Cash and cash equivalents [Member]	Mar. 31, 2014 Corporate debt securities issuer	Dec. 31, 2013 Corporate debt securities	Mar. 31, 2014 Cash, investment grade cash equivalents or U.S. treasury securities Minimum	Apr. 21, 2014 Other aggregated investments Securities of any one issuer (excluding the U.S. Government) Minimum Subsequent Event	Mar. 31, 2014 Other aggregated investments Securities of any one issuer (excluding the U.S. Government) Maximum	Apr. 21, 2014 Other aggregated investments Securities of any one issuer (excluding the U.S. Government) Maximum Subsequent Event	Mar. 31, 2014 Investor Fairholme Capital Management, L.L.C.
Schedule of Available-for-sale Securities [Line Items]
Common stock ownership percentage													27.10%
Investments, target portfolio allocations									50.00%	10.00%	10.00%	15.00%
Realized losses from the sale of available-for-sale securities	$ 400,000
Sales of investments	2,621,000	196,000
Maturities of investments	25,000,000	0
Money market funds	7,100,000
Debt securities	278,417,000			434,800,000		210,000,000	53,600,000
Preferred stock	3,373,000
Investments, number of issuers							2
Number of securities with net unrealized losses				0
Available-for-sale securities	281,790,000		146,972,000	224,842,000	124,949,000		53,575,000	22,023,000
Gross unrealized losses	$ 2,669,000		$ 2,213,000	$ 0	$ 0		$ 2,669,000	$ 2,213,000