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PER SHARE OF COMMON STOCK - Calculation of Basic and Diluted Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic net income per share:
Net income applicable to common stockholders													$ 89,575	$ 69,421	$ 111,422
Weighted average common shares outstanding (in shares)													54,695	56,996	59,358
Basic net income per share (in usd per share)	$ 0.34	$ 0.47	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.55	$ 0.37	$ 0.84	$ 0.32	$ 0.38	$ 0.34	$ 1.64	$ 1.22	$ 1.88
Diluted net income per share:
Net income applicable to common stockholders													$ 89,575	$ 69,421	$ 111,422
Weighted average common shares outstanding (in shares)													54,695	56,996	59,358
Dilutive shares from assumed conversion of convertible senior notes (in shares)													0	455	1,726
Dilutive stock options and restricted stock (in shares)													595	979	1,515
Diluted weighted average common shares outstanding (in shares)													55,290	58,430	62,599
Diluted net income per share (in usd per share)	$ 0.34	$ 0.46	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.54	$ 0.35	$ 0.80	$ 0.30	$ 0.36	$ 0.32	$ 1.62	$ 1.19	$ 1.78

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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