Prepaid Expenses, Deferred Costs, and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current portion of prepaid expenses, deferred costs, and other current assets
Prepaid expenses	$ 39,241	$ 36,207
Interest rate swap and cap contracts	0	1,872
Deferred costs and other current assets	14,712	46,560
Total	53,953	84,639
Noncurrent portion of prepaid expenses, deferred costs, and other noncurrent assets
Prepaid expenses	11,853	21,206
Interest rate swap and cap contracts	0	8,766
Deferred costs and other noncurrent assets	6,256	7,964
Total	$ 18,109	$ 37,936