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Fair Value Measurements (Fair Value Measurements Using Unobservable Inputs Method) (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at the beginning of period $ 151 $ 0
Reclassification of net unrealized gain on securities to prepaid expenses and other assets (7) 0
Unrealized gains (losses) related to investments (14) 21
Purchases 0 130
Settlements (130) 0
Balance at the end of period $ 0 $ 151