SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - New Accounting Standards - Effects of Adoption of Topic 842 on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 64,605	$ 66,555
Current portion of operating lease obligations	17,036	17,770
Operating lease obligations (non-current)	$ 52,235	54,477
Retained Earnings | ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease, net of tax, to beginning retained earnings		$ 400