Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current portion of other long-term liabilities
Interest rate swap and cap contracts	$ 23,916	$ 15,565
Operating lease liabilities	18,683	20,345
Acquisition related contingent consideration	9,490	4,963
Asset retirement obligations	6,517	5,701
Deferred revenue	4,295	3,386
Other	1,898	3,184
Total current portion of other long-term liabilities	64,799	53,144
Noncurrent portion of other long-term liabilities
Interest rate swap and cap contracts	26,994	9,723
Deferred revenue	3,850	5,589
Acquisition related contingent consideration	0	11,888
Other	6,883	10,670
Total noncurrent portion of other long-term liabilities	$ 37,727	$ 37,870