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Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 189,122
Secured notes [Member] | Secured Convertible Notes Due June 2018 [Member]    
Debt Instrument [Line Items]    
Long-term debt 0 109,122
Term loan [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 80,000