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	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 66,500	$ 66,555	$ 0
Operating lease obligations	53,945	54,477	0
Current portion of operating lease obligations	$ 17,314	17,770	$ 0
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease, net of tax, to beginning retained earnings		$ 400