EQUITY (Common Stock) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 27, 2020	Feb. 28, 2019	Dec. 31, 2018	Nov. 26, 2018
Class of Stock [Line Items]
Repurchase program cost	$ 10,449,000
Increase (Decrease) in Stockholders' Equity
Balance (in shares)	101,595,096
Issuance of stock (in shares)	7,000,000
Stock option exercises (in shares)	4,785,131
Repurchases of stock (in shares)	(400,000)
Vesting of restricted stock awards, net of shares withheld for tax (shares)	2,099,293
Balance (in shares)	115,243,029
AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)	163,509
Class A common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01			$ 0.01	$ 0.01
Common stock, shares issued (in shares)	115,242,028			101,594,095
Authorized amount			$ 150,000,000
Repurchase program cost	$ 10,400,000
Remaining available for repurchases of common stock	$ 139,600,000
Increase (Decrease) in Stockholders' Equity
Balance (in shares)	101,594,095
Issuance of stock (in shares)	7,000,000
Stock option exercises (in shares)	4,785,131
Repurchases of stock (in shares)	(400,000)
Vesting of restricted stock awards, net of shares withheld for tax (shares)	2,099,293
Balance (in shares)	115,242,028
Class A common stock | Subsequent event
Class of Stock [Line Items]
Authorized amount		$ 150,000,000
Class A common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)	163,509
Class B common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01			$ 0.01	$ 0.01
Common stock, shares issued (in shares)	1,000			1,000	1,000
Increase (Decrease) in Stockholders' Equity
Balance (in shares)	1,000
Issuance of stock (in shares)	0
Stock option exercises (in shares)	0
Repurchases of stock (in shares)	0
Vesting of restricted stock awards, net of shares withheld for tax (shares)	0
Balance (in shares)	1,000
Class B common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)	0
Class C common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01			$ 0.01	$ 0.01
Common stock, shares issued (in shares)	1			1
Increase (Decrease) in Stockholders' Equity
Balance (in shares)	1
Issuance of stock (in shares)	0
Stock option exercises (in shares)	0
Repurchases of stock (in shares)	0
Vesting of restricted stock awards, net of shares withheld for tax (shares)	0
Balance (in shares)	1
Class C common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)	0