Investments (Details) Available for Sale Investments (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, gross realized gains	$ 2,018,000	$ 4,869,000	$ 10,133,000
Total Cost	41,605,000	41,277,000
Gross Unrealized Gains	7,536,000	2,999,000
Gross Unrealized Losses	(677,000)	(1,170,000)
Total available-for-sale investments	48,464,000	43,106,000
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	3,963,000
Amortized Cost, Due after one year through five years	3,316,000
Amortized Cost, Due after five years	479,000
Amortized Cost, All maturities	7,758,000
Carrying Value, Due in one year or less	4,077,000
Carrying Value, Due after one year through five years	3,476,000
Carrying Value, Due after five years	473,000
Fixed maturities, Carrying Value	8,026,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	5,961,000	6,576,000
Less than 12 months, Gross Unrealized Loss	627,000	355,000
Greater than 12 months, Fair Value	2,249,000	5,575,000
Greater than 12 months, Gross Unrealized Loss	50,000	815,000
Other-than-temporary impairment charges on marketable equity securities	1,800,000	611,000	365,000
Gross realized losses	(2,138,000)	(825,000)	(410,000)
Net realized gain (loss)	(120,000)	4,044,000	9,723,000
Equity Securities and Other Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, gross realized gains	1,173,000	4,656,000	6,501,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Gross realized losses	(2,136,000)	(819,000)	(387,000)
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities, Cost	33,847,000	26,575,000
Gross Unrealized Gains	7,212,000	2,440,000
Gross Unrealized Losses	(621,000)	(1,114,000)
Marketable equity securities, Carrying Value	40,438,000	27,901,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	5,193,000	6,510,000
Less than 12 months, Gross Unrealized Loss	615,000	354,000
Greater than 12 months, Fair Value	45,000	2,757,000
Greater than 12 months, Gross Unrealized Loss	6,000	760,000
Other-than-temporary impairment charges on marketable equity securities	1,800,000	611,000	365,000
Foreign Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, gross realized gains	530,000	3,600,000	6,300,000
Domestic Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, gross realized gains	643,000	1,200,000	336,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, gross realized gains	845,000	213,000	3,632,000
Fixed maturities, Cost		14,702,000
Gross Unrealized Gains		559,000
Gross Unrealized Losses		(56,000)
Available-for-sale Securities, Debt Maturities [Abstract]
Fixed maturities, Carrying Value		15,205,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Gross realized losses	(2,000)	(6,000)	(23,000)
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Cost		831,000
Gross Unrealized Gains
Gross Unrealized Losses
Available-for-sale Securities, Debt Maturities [Abstract]
Fixed maturities, Carrying Value		831,000
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Cost	7,758,000	13,871,000
Gross Unrealized Gains	324,000	559,000
Gross Unrealized Losses	(56,000)	(56,000)
Available-for-sale Securities, Debt Maturities [Abstract]
Fixed maturities, Carrying Value	8,026,000	14,374,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	768,000	66,000
Less than 12 months, Gross Unrealized Loss	12,000	1,000
Greater than 12 months, Fair Value	2,204,000	2,818,000
Greater than 12 months, Gross Unrealized Loss	44,000	55,000
Spigit
Schedule of Available-for-sale Securities [Line Items]
Percentage of ownership after transaction	27.00%	30.00%
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Percent ownership of equity method investment	27.00%	30.00%	37.00%
Discontinued Operations | Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities, Cost		9,000,000
Gross Unrealized Gains		4,900,000
Gross Unrealized Losses		(96,000)
Marketable Securities, Equity Securities		13,800,000
Discontinued Operations | Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Cost		20,800,000
Gross Unrealized Gains		629,000
Gross Unrealized Losses		(68,000)
Available-for-sale Securities, Debt Maturities [Abstract]
Fixed maturities, Carrying Value		$ 21,400,000