SEGMENT INFORMATION - Schedule of Total Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Items excluded from segment assets:
Deferred tax assets	$ 189,380	$ 184,579
Segment Assets	2,588,529	$ 2,687,434	$ 2,769,557
Corporate Reconciling Items and Eliminations
Items excluded from segment assets:
Cash and other investments	86,131		61,432
Deferred tax assets	189,380		252,783
Reportable Segments | Operating Segments
Items excluded from segment assets:
Segment Assets	1,912,656		2,007,767
All Other Segments | Operating Segments
Items excluded from segment assets:
Segment Assets	$ 400,362		$ 447,575