SEGMENT INFORMATION - Schedule of Total Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Items excluded from segment assets:
Deferred tax assets	$ 77,614	$ 77,545
Total Consolidated Assets	2,767,041	$ 2,760,727	$ 2,729,116
Corporate Reconciling Items and Eliminations
Items excluded from segment assets:
Cash, restricted cash and other investments	186,295		190,777
Deferred tax assets	77,614		67,538
Reportable Segments | Operating Segments
Items excluded from segment assets:
Total Consolidated Assets	1,992,549		1,965,979
All Other Segments | Operating Segments
Items excluded from segment assets:
Total Consolidated Assets	$ 510,583		$ 504,822