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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
Jan. 19, 2017
Aug. 25, 2016
Mar. 31, 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%  
Liquidation preference (in dollars per share) $ 50.00 $ 50.00  
Dividend declared (in dollars per share) $ 1.00    
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