Organization and Significant Accounting Policies (Details 11) (Investments Valued Using Level 3 Inputs, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Investments Valued Using Level 3 Inputs
Investments measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period	$ 34,350
Purchases		3,040
Transfers into Level 3 investments		25,198
Total gains and losses included in gain on investments	(1,163)
Total gains and losses included in accumulated other comprehensive income	32,272	6,112
Transfers out of Level 3 investments	(65,419)
Cost basis of shares sold	(40)
Balance at the end of the period		$ 34,350