Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Fair Value Measurements (Schedule of Reconciliation of Fair Value Measurements of Assets and Liabilities Utilizing Level 3 Inputs) (Details))

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Fair Value Measurements (Schedule of Reconciliation of Fair Value Measurements of Assets and Liabilities Utilizing Level 3 Inputs) (Details)) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Reconciliation of Fair Value Measurements of Assets and Liabilities Utilizing Level 3 Inputs [Roll Forward]    
Fair value at the beginning of the period $ 35,656 $ 29,025
Settlements   (10,795)
Additions   43,576
Change in fair value recognized in earnings $ (19,936) (26,150)
Fair value at the end of the period $ 15,720 $ 35,656