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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenue $ 450,557 $ 426,449 $ 307,651
Cost of revenue 102,571 94,067 62,889
Gross margin 347,986 332,382 244,762
Research, development, and engineering expenses 69,791 55,831 44,315
Selling, general, and administrative expenses 156,674 148,699 123,509
Operating income 121,521 127,852 76,938
Foreign currency gain (loss) 1,122 1,031 (646)
Investment income 3,674 3,156 2,604
Other income (expense) 645 (283) (440)
Income from continuing operations before income tax expense 126,962 131,756 78,456
Income tax expense on continuing operations 19,298 20,915 11,273
Net income from continuing operations 107,664 110,841 67,183
Net income from discontinued operations (Note 19) 79,410 10,644 6,390
Net income $ 187,074 $ 121,485 $ 73,573
Basic earnings per weighted-average common and common-equivalent share:      
Net income from continuing operations (in dollars per share) $ 1.25 $ 1.28 $ 0.77
Net income from discontinued operations (in dollars per share) 0.92 0.12 0.08
Net income (in dollars per share) 2.17 1.40 0.85
Diluted earnings per weighted-average common and common-equivalent share:      
Net income from continuing operations (in dollars per share) 1.22 1.24 0.76
Net income from discontinued operations (in dollars per share) 0.91 0.12 0.07
Net income (in dollars per share) $ 2.13 $ 1.36 $ 0.83
Weighted-average common and common-equivalent shares outstanding:      
Basic (in shares) 86,296 86,858 86,946
Diluted (in shares) 87,991 89,071 88,901
Cash dividends per common share (in dollars per share) $ 0.21 $ 0.00 $ 0.00