Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating lease right-of-use assets
Unrelated Parties	$ 1,042,373	$ 1,002,151
Related Parties	27,580	30,066
Total	1,069,953	1,032,217
Current operating lease liabilities
Unrelated Parties	220,090	214,377
Related Parties	6,329	6,036
Total	226,419	220,413
Non-current operating lease liabilities
Unrelated Parties	885,858	848,215
Related Parties	24,092	27,152
Total	909,950	875,367
Total operating lease liabilities
Unrelated Parties	1,105,948	1,062,592
Related Parties	30,421	33,188
Total	1,136,369	1,095,780
Property and equipment, net
Unrelated Parties	5,891	5,644
Related Parties	0	0
Total	5,891	5,644
Current portion of long-term debt and notes payable
Unrelated Parties	793	663
Related Parties	0	0
Total	793	663
Long-term debt, net of current portion
Unrelated Parties	13,525	13,491
Related Parties	0	0
Total	13,525	13,491
Total finance lease liabilities
Unrelated Parties	14,318	14,154
Related Parties	0	0
Total	$ 14,318	$ 14,154