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Summary of Significant Accounting Policies (Revised Condensed Consolidated Statement of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:                
Net income (loss) $ (562) $ 165 $ 4,082 $ (12,579) $ 327 $ 98 $ 3,685 $ (12,154)
Depreciation and amortization $ 6,318     5,920     18,859 17,217
Deferred taxes               (1,177)
Inventory decrease             3,793 3,798
Prepaid expenses and prepaid income taxes decrease (increase)             (86) (72)
Net cash provided by operating activities             27,932 21,285
Cash flows from investing activities:                
Purchase of rental equipment, property and other equipment             (11,964) (54,077)
Net cash used in investing activities             (11,814) (54,247)
Net change in cash and cash equivalents             $ 15,967 (33,146)
As Reported                
Cash flows from operating activities:                
Net income (loss)       (12,232) 573 357   (11,302)
Depreciation and amortization       5,867       17,108
Deferred taxes               (929)
Inventory decrease               1,861
Prepaid expenses and prepaid income taxes decrease (increase)               198
Net cash provided by operating activities               20,609
Cash flows from investing activities:                
Purchase of rental equipment, property and other equipment               (53,401)
Net cash used in investing activities               (53,571)
Net change in cash and cash equivalents               (33,146)
Revisions | Revision of Prior Period Financial Statements                
Cash flows from operating activities:                
Net income (loss)       (347) $ (246) $ (259)   (852)
Depreciation and amortization       $ 53       109
Deferred taxes               (248)
Inventory decrease               1,937
Prepaid expenses and prepaid income taxes decrease (increase)               (270)
Net cash provided by operating activities               676
Cash flows from investing activities:                
Purchase of rental equipment, property and other equipment               (676)
Net cash used in investing activities               (676)
Net change in cash and cash equivalents               $ 0