Fair Value Measurements Level 3 Unobservable Input Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			$ 0
Transfer into Level 3			235,677
Gains (losses) included in earnings			(4,061)
Purchases			15,500
Ending balance	247,116		247,116
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Unrealized Gains (Losses), Changes in Assets and Liabilities, Continued to be Held, Amount	$ (4,061)	$ 0	$ (4,061)	$ 0