SEGMENT REPORTING (Total Assets by Geographical Area) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,546,042	$ 3,704,278
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,528,087	2,572,494
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	1,014,805	1,128,458
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,150	$ 3,326