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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 6 Months Ended
Apr. 17, 2017
Jan. 19, 2017
Aug. 25, 2016
Mar. 31, 2017
Jun. 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%    
Liquidation preference (in dollars per share) $ 50.00 $ 50.00 $ 50.00    
Dividend declared (in dollars per share) 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        
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