Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Outstanding Options Narrative (Details)

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EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Outstanding Options Narrative (Details) - Stock Option
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Prior to 2008  
Class of Stock [Line Items]  
Exercised (in shares) 173,853
Oct-12  
Class of Stock [Line Items]  
Exercised (in shares) 15,972
Sep-13  
Class of Stock [Line Items]  
Exercised (in shares) 51,306
2014  
Class of Stock [Line Items]  
Exercised (in shares) 216,186
2015  
Class of Stock [Line Items]  
Exercised (in shares) 202,446
Intrinsic value of options exercised | $ $ 0.8
2016  
Class of Stock [Line Items]  
Exercised (in shares) 266,657
Intrinsic value of options exercised | $ $ 0.4
Held by the former Manager | Prior to 2008  
Class of Stock [Line Items]  
Exercised (in shares) 111,770
Issued to the Manager and subsequently transferred to certain Manager’s employees | Prior to 2008  
Class of Stock [Line Items]  
Exercised (in shares) 61,417
Issued to the Manager and subsequently transferred to certain Manager’s employees | Oct-12  
Class of Stock [Line Items]  
Intrinsic value of options exercised | $ $ 0.2
Issued to the Manager and subsequently transferred to certain Manager’s employees | Sep-13  
Class of Stock [Line Items]  
Intrinsic value of options exercised | $ $ 0.9
Issued to the Manager and subsequently transferred to certain Manager’s employees | 2014  
Class of Stock [Line Items]  
Exercised (in shares) 215,853
Intrinsic value of options exercised | $ $ 4.1
Issued to the Manager and subsequently transferred to certain Manager’s employees | 2016  
Class of Stock [Line Items]  
Options forfeited (in shares) 16,748
Issued to the independent directors | Prior to 2008  
Class of Stock [Line Items]  
Exercised (in shares) 666
Issued to the independent directors | 2014  
Class of Stock [Line Items]  
Exercised (in shares) 333