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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2015 (remaining six months) $ 1,586  
2016 9,487  
2017 3,901  
2018 4,954  
2019 6,899  
Thereafter 494,552  
Total $ 521,379 $ 550,221