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Summary of Significant Accounting Policies (Revised Condensed Consolidated Statement of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:            
Net income $ 165 $ 4,082 $ 327 $ 98 $ 4,247 $ 425
Depreciation and amortization $ 6,301   5,720   12,541 11,297
Deferred taxes           219
Inventory decrease         5,262 2,311
Prepaid expenses and prepaid income taxes increase         (95) (225)
Net cash provided by operating activities         14,802 6,769
Cash flows from operating activities:            
Purchase of rental equipment, property and other equipment         (10,989) (29,724)
Net cash used in investing activities         (10,792) (29,798)
Net change in cash and cash equivalents         $ 3,859 (22,717)
As Reported            
Cash flows from operating activities:            
Net income     573 357   930
Depreciation and amortization     5,683     11,241
Deferred taxes           356
Inventory decrease           1,200
Prepaid expenses and prepaid income taxes increase           (22)
Net cash provided by operating activities           6,447
Cash flows from operating activities:            
Purchase of rental equipment, property and other equipment           (29,402)
Net cash used in investing activities           (29,476)
Net change in cash and cash equivalents           (22,717)
Revisions | Revision of Prior Period Financial Statements            
Cash flows from operating activities:            
Net income     (246) $ (259)   (505)
Depreciation and amortization     $ 37     56
Deferred taxes           (137)
Inventory decrease           1,111
Prepaid expenses and prepaid income taxes increase           (203)
Net cash provided by operating activities           322
Cash flows from operating activities:            
Purchase of rental equipment, property and other equipment           (322)
Net cash used in investing activities           (322)
Net change in cash and cash equivalents           $ 0