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Income Taxes (Schedule of Reconciliation of Income Tax Provision (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax $ 40,730 $ 11,901 $ 29,837
REIT income not subject to federal income tax (16,949) (11,285) (8,773)
Pension contribution deducted at higher tax rate     (5,665)
Change in valuation allowance (395) (395)  
State income taxes, net of federal income tax 4,458 903 3,712
Permanent book-tax differences (1,315) (793) (771)
Other items, net 594 679 859
Income taxes $ 27,123 $ 1,010 $ 19,199
Effective tax rate 14.00% 1.80% 13.50%