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Investments, Available-For-Sale (Details) (USD $)	12 Months Ended
Investments, Available-For-Sale (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments classified as available-for-sale
Fair Value of Total investments		$ 28,968,000
Payments to Acquire Available-for-sale Securities, Total		750,000	3,000,000
Proceeds from sale of available-for-sale securities	29,947,000	12,306,000
Gain on sale of available-for-sale securities, net	8,500,000	2,100,000
Gross realized gains reclassified from accumulated other comprehensive income	4,900,000	1,400,000
Total investments
Investments classified as available-for-sale
Adjusted cost		21,436,000
Gross Unrealized Gains		7,532,000
Fair Value of Total investments		28,968,000
Equity funds
Investments classified as available-for-sale
Adjusted cost		19,862,000
Gross Unrealized Gains		7,362,000
Fair Value of Equity funds		27,224,000
Bond funds
Investments classified as available-for-sale
Adjusted cost		1,574,000
Gross Unrealized Gains		170,000
Fair Value of Bond funds		$ 1,744,000