NET INCOME PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 15, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average common shares outstanding - basic	45,061	45,564	45,211	44,559	44,288	44,019	43,719	43,254	45,101	43,822	42,649
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities									1,202	1,056	846
Anti-dilutive potential common shares (in thousands of shares)									941	741	3,207
Weighted-average common shares outstanding - diluted	45,773	46,428	46,550	46,204	45,541	44,758	44,180	44,101	46,303	44,878	43,495
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)									0	4	565
Non-vested restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive potential common shares (in thousands of shares)									941	737	2,642
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Long-term Debt, Gross												$ 125.0