OPERATING SEGMENTS - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	$ 1,049,449	$ 1,053,670
United States
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	946,125	954,102
Canada
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	64,383	70,691
EMEA
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	22,940	23,587
Other
Revenue and Long-Lived Assets Outside of the United States
Total long- lived assets	$ 16,001	$ 5,290