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Summary of Significant Accounting Policies and Other Items - Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Depreciation expense      
Total depreciation and amortization $ 38,854 $ 30,153 $ 23,271
Cost of Sales | Product revenue      
Depreciation expense      
Depreciation - Cost of sales 3,304 3,262 3,169
Cost of Sales | Rental revenue      
Depreciation expense      
Depreciation - Cost of sales 24,881 17,997 14,912
Cost of Sales | Field service and other revenue      
Depreciation expense      
Depreciation - Cost of sales 9,986 8,456 4,786
Selling, General and Administrative Expenses      
Depreciation expense      
Depreciation - SG&A $ 683 $ 438 $ 404