SHARE-BASED COMPENSATION PLANS - Share-Based Compensation Expense and Income Tax Benefits Recognized During the Periods (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7,539	$ 7,523	$ 10,630	$ 14,922
Income tax benefit	(1,307)	(1,374)	(1,485)	(2,534)
Share-based compensation expense, net of tax	6,232	6,149	9,145	12,388
Stock option and stock purchase plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1,052	1,656	2,409	3,475
Unvested stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 6,487	$ 5,867	$ 8,221	$ 11,447

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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