EARNINGS PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator
Net income attributable to common stockholders	$ 269,314	$ 148,141	$ 60,034
Denominator
Basic weighted average common shares and common equivalents (in shares)	178,305,738	105,621,242	65,284,251
Dilutive stock options and restricted stock units (in shares)	416,006	221,192	236,421
Dilutive weighted average common shares (in shares)	178,721,744	105,842,434	65,520,672
Net income attributable to common stockholders, per:
Basic common share (in dollars per share)	$ 1.51	$ 1.40	$ 0.92
Diluted common share (in dollars per share)	$ 1.51	$ 1.40	$ 0.92