OPERATING SEGMENTS - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenue and Long-Lived Assets Outside of the United States
Total revenue	$ 110,234	$ 113,318
Total long- lived assets	457,665		$ 460,593
United States
Revenue and Long-Lived Assets Outside of the United States
Total revenue	96,192	103,191
Total long- lived assets	402,668		405,767
Canada
Revenue and Long-Lived Assets Outside of the United States
Total revenue	14,042	$ 10,127
Total long- lived assets	$ 54,997		$ 54,826