Acquisition Activity - Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands	Sep. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Assets acquired:
Deferred tax asset	$ 3,205
Intangible assets	86,500
Liabilities assumed:
Ending balance		$ 243,766	$ 26,563
RU
Business Acquisition [Line Items]
Cash and cash equivalents	329,000
Working capital adjustment and additional cash contributions	1,704
Total consideration	330,704
Assets acquired:
Cash and cash equivalents	5,200
Accounts receivable	10,700
Prepaid expenses	4,600
Property and equipment, net	36,996
Operating lease assets	75,800
Intangible assets	86,500
Other assets	600
Total assets acquired	223,601
Liabilities assumed:
Accounts payable	1,200
Accrued expenses	6,700
Deferred revenue	22,700
Operating lease liabilities, current	11,200
Operating lease liabilities, long-term	67,000
Other liabilities	1,300
Total liabilities assumed	110,100
Net assets acquired	113,501
Ending balance	$ 217,203