Summary of Significant Accounting Policies - Leases Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2020 USD ($) lease renewal_option	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Renewal option | renewal_option			1
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
Cumulative effect of new accounting principle in period of adoption	$ 1,862,463	$ 2,285,134	$ 1,136,729	$ 1,464,227
Total minimum lease payments			$ 3,354,702
Number of leases not yet commenced | lease			7
Total undiscounted lease payment			$ 236,200
Adjustment
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 5,781	$ (30,233)
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term			5 years
Lessee, operating lease, renewal term			5 years
Lease operating lease, term			10 years
Minimum | Vehicle And Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term			1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term			10 years
Lessee, operating lease, renewal term			1 year
Lease operating lease, term			25 years
Maximum | Vehicle And Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term			7 years
ASU 2016-02 | Adjustment
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 5,800