Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 5,930	$ 5,050	$ 1,409
Charged (Credited) to Cost and Expenses	(117)	946	812
Debited (Credited) to Other Accounts	24	3	77
Amount Written Off	(3,010)	(402)	(369)
Acquisition and translation adjustments	(31)	333	3,121
Balance at End of Period	2,796	5,930	5,050
Accounts Receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	5,738	4,796	1,240
Charged (Credited) to Cost and Expenses	(127)	1,008	727
Debited (Credited) to Other Accounts	12	3	77
Amount Written Off	(3,010)	(402)	(369)
Acquisition and translation adjustments	(31)	333	3,121
Balance at End of Period	2,582	5,738	4,796
Investment in sales-type leases
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	192	254	169
Charged (Credited) to Cost and Expenses	10	(62)	85
Debited (Credited) to Other Accounts	12	0	0
Amount Written Off	0	0	0
Acquisition and translation adjustments	0	0	0
Balance at End of Period	$ 214	$ 192	$ 254