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Discontinued Operations - Discontinued operations results of operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lease revenue $ 3,485 $ 3,303
Depreciation, depletion and amortization 1,487 2,398
Operating expenses 882 865
Property taxes 753 675
Management company indirect 592 361
Corporate expenses 645 679
Total cost of operations 4,359 4,978
Total operating profit 1,355 97
Interest expense (588) (843)
Income before income taxes 2,313 (753)
Provision for income taxes 672 (60)
Income from discontinued operations $ 86 $ 1,722
Earnings per common share:    
Basic earnings per common share Discontinued operations $ 0.01 $ 0.17
Diluted earnings per common share discontinued operations $ 0.01 $ 0.17
Discontinued Operations, Disposed of by Sale [Member]    
Lease revenue $ 238 $ 7,547
Depreciation, depletion and amortization 29 1,885
Operating expenses 95 1,178
Property taxes 20 798
Management company indirect 0 178
Corporate expenses 0 747
Total cost of operations 144 4,786
Total operating profit 94 2,761
Interest expense 0 (400)
Gain on sale of buildings 23 0
Income before income taxes 117 2,361
Provision for income taxes 31 639
Income from discontinued operations $ 86 $ 1,722
Earnings per common share:    
Basic earnings per common share Discontinued operations $ 0.01 $ 0.17
Diluted earnings per common share discontinued operations $ 0.01 $ 0.17