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Share-Based Compensation (Narrative) (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unamortized share-based compensation expense | $ $ 35,436,000
Recognized weighted average period 3 years 3 months 18 days
Warrants outstanding 68,000
Restricted Stock [Member] | General and administrative [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Recognized weighted average period 1 year
Unamortized share-based compensation expense | $ $ 1,952,000
2013 Equity Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for grant 734,391
Common Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Warrants awarded 17,000