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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and Cash Equivalents, at Carrying Value, Total $ 93,108 $ 32,335 $ 119,471 $ 17,399
Cash and Cash Equivalents [Member] | Asset-backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and Cash Equivalents, at Carrying Value, Total 8,185      
Cash and Cash Equivalents [Member] | Corporate Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and Cash Equivalents, at Carrying Value, Total $ 20,404