OPERATING SEGMENTS - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	$ 1,039,551	$ 1,053,670
United States
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	937,547	954,102
Canada
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	65,630	70,691
EMEA
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	21,137	23,587
Other
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	$ 15,237	$ 5,290