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Summary of Significant Accounting Policies (Revised Consolidated Statements of Income) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue:    
Revenues $ 17,890 $ 17,991
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 7,897 6,220
Depreciation and amortization 6,240 5,577
Total operating costs and expenses 18,163 18,136
Operating income (loss) (273) (145)
Income before provision for income taxes (461) 156
Income tax (expense) benefit 4,543 (58)
Net income $ 4,082 $ 98
Basic (in USD per share) $ 0.31 $ 0.01
Diluted (in USD per share) $ 0.30 $ 0.01
As Reported    
Revenue:    
Revenues   $ 17,991
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below   5,885
Depreciation and amortization   5,558
Total operating costs and expenses   17,782
Operating income (loss)   209
Income before provision for income taxes   510
Income tax (expense) benefit   (153)
Net income   $ 357
Basic (in USD per share)   $ 0.03
Diluted (in USD per share)   $ 0.03
Revisions | Revision Of Prior Period Financial Statements    
Revenue:    
Revenues   $ 0
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below   335
Depreciation and amortization   19
Total operating costs and expenses   354
Operating income (loss)   (354)
Income before provision for income taxes   (354)
Income tax (expense) benefit   95
Net income   $ (259)
Basic (in USD per share)   $ (0.02)
Diluted (in USD per share)   $ (0.02)