Summary of Significant Accounting Policies, Accounting Standards (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements [Abstract]
Operating lease right-of-use assets	$ 174,317,000	$ 159,641,000
Liabilities for operating leases	243,109,000	$ 209,866,000
ASU 2016-02 [Member]
New Accounting Pronouncements [Abstract]
Operating lease right-of-use assets	168,149,000
Liabilities for operating leases	$ 175,778,000