SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net income available to common shareholders	$ 161,441	$ 121,027	$ 73,548
Weighted average number of common shares outstanding (in shares)	58,462	43,142	36,828
Effect of dilutive stock options (in shares)	69	6	62
Incremental Common Shares Attributable To Dilutive Restricted Grants	83	100	254
Weighted average number of common shares outstanding used to calculate diluted earnings per share (in shares)	58,614	43,248	37,144