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Stockholders' and Mezzanine equity - Preferred Stock Dividend and Special Stock Dividend (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jul. 13, 2017
Apr. 17, 2017
Jan. 19, 2017
Aug. 25, 2016
Mar. 31, 2017
Sep. 30, 2017
Special Stock Dividend Declared            
Distributions from JEH         $ 17.5  
Volume weighted average price per share, period           5 years
Series A preferred stock            
Preferred Stock Dividend Declared            
Dividend rate (as a percent) 8.00% 8.00% 8.00% 8.00%    
Liquidation preference (in dollars per share) $ 50.00 $ 50.00 $ 50.00 $ 50.00    
Dividend declared (in dollars per share) $ 1.00 1.00 $ 1.00      
Dividend declared, cash portion (in dollars per share)   0.83        
Dividend declared, common stock portion (in dollars per share)   $ 0.17        
Average volume-weighted price per share percentage (as a percent) 95.00% 95.00%        
Average volume-weighted price per share percentage, consecutive days 5 days 5 days        
Class A common stock            
Special Stock Dividend Declared            
Special stock dividend declared per share (in shares)         0.087423  
JEH            
Special Stock Dividend Declared            
Number of additional common units purchased           4,999,927
JEH            
Special Stock Dividend Declared            
Share price (in dollars per share)           $ 3.50