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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease costs $ 16,939 $ 17,015
Amortization of right-of-use assets, financing leases 1,011 309
Interest expense for financing lease liabilities 9,891 6,557
Total financing lease costs 10,902 6,866
Short term lease costs 13,322 0
Variable lease costs 5,229 4,399
Operating cash flows used in operating leases (15,089) (16,121)
Operating cash flows used in financing leases (8,523) (5,585)
Financing cash flows used in financing leases (7,519) 0
Right-of-use assets reduced through lease modifications and reassessments 6,755 2,717
Right-of-use assets obtained in exchange for operating lease liabilities 17,107 34,014
Right-of-use assets obtained through lease modifications and reassessments 46,495 0
Charge to financing lease obligation $ 1,304 $ 971
Operating leases, remaining lease term 11 years  
Finance leases, remaining lease term 25 years  
Operating leases, discount rate 10.30%  
Finance leases, discount rate 13.10%