The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Segment Reporting - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales to external customers	$ 112,844	$ 99,705	$ 98,244	$ 92,834	$ 106,423	$ 90,250	$ 82,682	$ 81,562	$ 403,627	$ 360,917	$ 325,584
Segment profit	$ 64,551	$ 52,317	$ 57,691	$ 53,786	$ 62,094	$ 52,034	$ 46,760	$ 43,749	228,345	204,637	177,960
General and administrative									47,652	43,807	40,813
Depreciation and amortization									18,313	16,588	13,868
Research and development									39,706	35,376	30,125
Income from operations									5,754	5,322	13,284
Operating Segments
Segment Reporting Information [Line Items]
Segment profit									111,425	101,093	98,090
3D Manufacturing
Segment Reporting Information [Line Items]
Net sales to external customers									264,430	243,464	236,313
3D Manufacturing \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									80,775	77,537	73,656
Construction BIM
Segment Reporting Information [Line Items]
Net sales to external customers									96,185	86,349	65,056
Construction BIM \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									27,513	21,077	14,799
Emerging Verticals
Segment Reporting Information [Line Items]
Net sales to external customers									43,012	31,104	24,215
Emerging Verticals \| Operating Segments
Segment Reporting Information [Line Items]
Segment profit									$ 3,137	$ 2,479	$ 9,635