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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic net income per share:
Net income applicable to common stockholders													$ 69,421	$ 111,422	$ 119,433
Weighted average common shares outstanding (in shares)													56,996	59,358	63,729
Basic net income per share (in usd per share)	$ 0.21	$ 0.08	$ 0.55	$ 0.37	$ 0.84	$ 0.32	$ 0.38	$ 0.34	$ 0.37	$ 0.52	$ 0.55	$ 0.42	$ 1.22	$ 1.88	$ 1.87
Diluted net income per share:
Net income applicable to common stockholders													$ 69,421	$ 111,422	$ 119,433
Weighted average common shares outstanding (in shares)													56,996	59,358	63,729
Dilutive shares from assumed conversion of convertible senior notes (in shares)													455	1,726	794
Dilutive stock options and restricted stock (in shares)													979	1,515	1,239
Diluted weighted average common shares outstanding (in shares)													58,430	62,599	65,762
Diluted net income per share (in usd per share)	$ 0.21	$ 0.08	$ 0.54	$ 0.35	$ 0.80	$ 0.30	$ 0.36	$ 0.32	$ 0.36	$ 0.51	$ 0.53	$ 0.42	$ 1.19	$ 1.78	$ 1.82

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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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