SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,599,861	$ 3,704,278
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,681,409	2,572,494
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	914,690	1,128,458
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,762	$ 3,326