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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 5,050 $ 1,409 $ 1,368
Charged to Cost and Expenses 946 812 354
Credited to Other Accounts 3 77 134
Amount Written Off (402) (369) (447)
Acquisition and translation adjustments 333 3,121 0
Balance at End of Period 5,930 5,050 1,409
Accounts Receivable      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 4,796 1,240 1,206
Charged to Cost and Expenses 1,008 727 453
Credited to Other Accounts 3 77 28
Amount Written Off (402) (369) (447)
Acquisition and translation adjustments 333 3,121 0
Balance at End of Period 5,738 4,796 1,240
Investment in sales-type leases      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 254 169 162
Charged to Cost and Expenses (62) 85 (99)
Credited to Other Accounts 0 0 106
Amount Written Off 0 0 0
Acquisition and translation adjustments 0 0 0
Balance at End of Period $ 192 $ 254 $ 169