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| Key Financials (IFRS) | 2014 | 2015 | 2016 | 2017 | 2018 | +/- previous year | |
| Total net sales | in € thousand | 531,080 | 629,141 | 651,544 | 690,336 | 729,170 | +5.6% |
| Europe | % | 40.5 | 36.7 | 35.7 | 36.3 | 36.1 | |
| North/South America | % | 35.8 | 38.5 | 37.8 | 37.7 | 36.8 | |
| Asia/Pacific/ Africa | % | 23.7 | 24.8 | 26.5 | 26.0 | 27.1 | |
| EBITDA | in € thousand | 122,777 | 152,617 | 172,323 | 177,392 | 185,657 | +4.7% |
| EBITDA margin | % | 23.1 | 24.3 | 26.4 | 25.7 | 25.5 | |
| EBIT | in € thousand | 95,658 | 119,256 | 139,619 | 145,511 | 153,717 | +5.6% |
| EBIT margin | % | 18.0 | 19.0 | 21.4 | 21.1 | 21.1 | |
| Profit for the year1 | in € thousand | 65,746 | 80,835 | 96,265 | 92,112 | 106,356 | +15.5% |
| Profit for the year1 | % | 12.4 | 12.8 | 14.8 | 13.3 | 14.6 | |
| Cash flow | in € thousand | 90,577 | 111,085 | 125,509 | 131,448 | 138,819 | +5.6% |
| Equity ratio1 | % | 60.8 | 65.2 | 63.2 | 67.5 | 69.4 | |
| Total assets | in € thousand | 716,784 | 810,877 | 846,465 | 869,981 | 974,071 | +12.0% |
| R&D expenses | in € thousand | 29,369 | 31,911 | 34,787 | 36,489 | 45,265 | +24.1% |
| Earnings per share | in € | 1.28 | 1.58 | 1.87 | 1.79 | 2.07 | +15.6% |
| Number of employees, annual average | 2,880 | 2,969 | 3,029 | 3,134 | 3,292 | +5.0% |
1 incl. non-controlling interests