Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total net sales	$ 341,009	$ 318,609	$ 652,906	$ 618,714
Point-in-Time
Disaggregation of Revenue [Line Items]
Total net sales	289,408	266,849	551,542	516,813
Over Time
Disaggregation of Revenue [Line Items]
Total net sales	51,601	51,760	101,364	101,901
Americas
Disaggregation of Revenue [Line Items]
Total net sales	129,791	121,648	249,512	240,087
Americas | Point-in-Time
Disaggregation of Revenue [Line Items]
Total net sales	105,670	102,034	202,211	200,338
Americas | Over Time
Disaggregation of Revenue [Line Items]
Total net sales	24,121	19,614	47,301	39,749
EMEIA
Disaggregation of Revenue [Line Items]
Total net sales	110,041	100,549	215,453	195,288
EMEIA | Point-in-Time
Disaggregation of Revenue [Line Items]
Total net sales	90,487	77,485	177,394	149,528
EMEIA | Over Time
Disaggregation of Revenue [Line Items]
Total net sales	19,554	23,064	38,059	45,760
APAC
Disaggregation of Revenue [Line Items]
Total net sales	101,177	96,412	187,941	183,339
APAC | Point-in-Time
Disaggregation of Revenue [Line Items]
Total net sales	93,251	87,330	171,937	166,947
APAC | Over Time
Disaggregation of Revenue [Line Items]
Total net sales	$ 7,926	$ 9,082	$ 16,004	$ 16,392