Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current portion of other long-term liabilities
Interest rate swap and cap contracts	$ 24,737	$ 15,565
Operating lease liabilities	18,374	20,345
Acquisition related contingent consideration	6,818	4,963
Asset retirement obligations (see Note 10. Asset Retirement Obligations)	5,665	5,701
Deferred revenue	5,061	3,386
Other	2,965	3,184
Total current portion of other long-term liabilities	63,620	53,144
Noncurrent portion of other long-term liabilities
Interest rate swap and cap contracts	33,973	9,723
Deferred revenue	3,605	5,589
Acquisition related contingent consideration	0	11,888
Other	8,686	10,670
Total noncurrent portion of other long-term liabilities	$ 46,264	$ 37,870