CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenues:
Total revenues	[2]	$ 2,294,965	[1]	$ 2,100,802	[1]	$ 2,136,606
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		955,136		880,408		915,153
Gross profit		1,339,829		1,220,394		1,221,453
Operating expenses:
Selling and administrative		437,084		390,669		348,913
Engineering and development		322,824		301,505		307,305
Acquired intangible assets amortization		40,147		39,191		30,530
Restructuring and other		(13,880)		15,232		9,362
Total operating expenses		786,175		746,597		696,110
Income from operations		553,654		473,797		525,343
Non-operating (income) expense:
Interest income		(24,785)		(26,704)		(17,805)
Interest expense		23,145		31,269		21,663
Other (income) expense, net		29,522		1,431		(2,927)
Income before income taxes		525,772		467,801		524,412
Income tax provision		58,304		16,022		266,720
Net income		$ 467,468		$ 451,779		$ 257,692
Net income per common share:
Basic		$ 2.74		$ 2.41		$ 1.30
Diluted		$ 2.60		$ 2.35		$ 1.28
Weighted average common shares—basic		170,425		187,672		198,069
Weighted average common shares—diluted		179,459		192,605		201,641
Cash dividend declared per common share		$ 0.36		$ 0.36		$ 0.28
Product [Member]
Revenues:
Total revenues		$ 1,887,674		$ 1,729,621		$ 1,784,695
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		782,047		727,138		760,967
Service [Member]
Revenues:
Total revenues		407,291		371,181		351,911
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 173,089		$ 153,270		$ 154,186

[1] Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.

[2] Revenues attributable to a country are based on location of customer site.