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Income Taxes (Schedule of Reconciliation of Income Tax Provision (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax $ 11,901 $ 29,837 $ 41,466
REIT income not subject to federal income tax (11,285) (8,773) (20,651)
U.S. tax rate change on deferred tax assets and liabilities     10,528
Pension contribution deducted at higher tax rate   (5,665)  
Change in valuation allowance (395)   140
State income taxes, net of federal income tax 903 3,712 2,608
Domestic production activities deduction     (1,511)
Permanent book-tax differences (793) (771) (252)
Research and development credits     (294)
Other items, net 679 859 (13)
Income tax provision $ 1,010 $ 19,199 $ 32,021
Effective tax rate 1.80% 13.50% 27.00%