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Stockholders' and Mezzanine equity - Equity Distribution Agreement (Details) - Class A common stock - USD ($)
$ in Millions
Mar. 31, 2017
May 24, 2016
Common Stock    
Aggregate offering proceeds remained available to be issued and sold under the Equity Distribution Agreement $ 62.2  
Managers under Equity Distribution Agreement    
Common Stock    
Offering price to sell common stock shares under Equity Distribution Agreement   $ 73.0