Fair Value Measurement -Level 3 Reconciliation (Details) (Unobservable Inputs (Level 3), Equity Securities [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Unobservable Inputs (Level 3) | Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 717	$ 0	$ 750	$ 0
Total unrealized gains included in earnings relating to assets still held at the reporting date	105	0	72	0
Purchases	1,000	0	1,000	0
Ending balance	$ 1,822	$ 0	$ 1,822	$ 0