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Share-Based Compensation (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unamortized share-based compensation expense | $ $ 33,715
Recognized weighted average period 3 years 1 month 6 days
Warrants outstanding (in shares) 68,000
Common Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Warrants awarded (in shares) 17,000
2013 Equity Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for grant (in shares) 626,225
Restricted Stock [Member] | General and administrative [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Recognized weighted average period 8 months
Unamortized share-based compensation expense | $ $ 1,441