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Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Oct. 22, 2018
Sep. 30, 2018
Sep. 30, 2017
EQUITY (Textual) [Abstract]      
Proceeds from preferred stock issuance, net of offering costs   $ 342,299 $ 0
Outstanding unvested equity compensation awards   1,414,780  
Additional equity compensation awards that could vest if certain targets are achieved   570,000  
Equity compensation awards granted during the period   687,470  
Weighted average grant date fair value of equity awards granted during the period   $ 22.61  
Employee Stock [Member]      
EQUITY (Textual) [Abstract]      
Employee Stock Purchase Plan shares issued during period   53,757  
Stock Compensation Plan [Member]      
EQUITY (Textual) [Abstract]      
Vested common stock   199,064  
Cash settled UUD [Member]      
EQUITY (Textual) [Abstract]      
Unvested Dividend Equivalent Value   $ 2,400  
Subsequent Event [Member] | Maurepas Pipeline LLC [Member]      
EQUITY (Textual) [Abstract]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   49.00%  
Subsequent Event [Member] | Noncontrolling Interest [Member]      
EQUITY (Textual) [Abstract]      
Proceeds from preferred stock issuance, net of offering costs $ 350,000    
Dividends, Preferred Stock, Cash 2,200    
Base price, repurchase option on noncontrolling interest $ 350,000    
Annual increase is base price, repurchase option, noncontrolling interest 1.00%    
Preferred stock non-call period 24 months