Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE (Outstanding Options Summary) (Details)

v3.19.2
EQUITY AND EARNINGS PER SHARE (Outstanding Options Summary) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2019
Nov. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     9,132,583   9,132,583    
Options granted (in shares)         695,652    
Weighted average strike price (in dollars per share)     $ 3.79   $ 3.79   $ 3.72
Held by the former Manager              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     2,705,253   2,705,253    
Issued to the former Manager and subsequently transferred to certain of the Manager’s employees              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     2,304,990   2,304,990    
Issued to the former Manager and subsequently transferred to certain of the Manager’s employees | February 2017              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     1,152,495   1,152,495    
Issued to the former Manager and subsequently transferred to certain of the Manager’s employees | April 2018              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     1,152,495   1,152,495    
Issued to the independent directors              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     333   333    
Drive Shake employees              
Related Party Transaction [Line Items]              
Stock options outstanding (in shares)     4,122,007   4,122,007    
Stock options              
Related Party Transaction [Line Items]              
Vesting period (in years)   3 years          
Stock-based compensation expense     $ 1.2 $ 0.5 $ 2.4 $ 0.8  
Stock options | Tranche One              
Related Party Transaction [Line Items]              
Options granted (in shares)   3,351,355          
Stock options | Tranche Two              
Related Party Transaction [Line Items]              
Options granted (in shares)   75,000          
Subsequent event              
Related Party Transaction [Line Items]              
Number of options reverted (in shares) 921,992            
Subsequent event | Stock options              
Related Party Transaction [Line Items]              
Stock-based compensation expense $ (1.2)