Fair Value Measurements, Investments Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) (Investments Valued Using Level 3 Inputs [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Investments Valued Using Level 3 Inputs [Member]
Investments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Beginning balance of Level 3 investments	$ 0
Total gain included in accumulated other comprehensive income (loss)	1,231
Transfers out of Level 3 investments	(1,231)
Ending balance of Level 3 investments	$ 0