Summary of Significant Accounting Policies - Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	$ 70,486	$ 60,121
Operating Lease, Right-of-Use Asset	$ 313,941	$ 330,322

Amount, after accumulated amortization, of right-of-use asset from finance lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

Name:	us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant