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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1],[2] | Sep. 30, 2018 | [2],[3] | Jul. 01, 2018 | [2],[4] | Apr. 01, 2018 | [5] | Dec. 31, 2017 | [6],[7] | Oct. 01, 2017 | [7],[8] | Jul. 02, 2017 | [7],[9] | Apr. 02, 2017 | [10] | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 519,558 | $ 566,848 | $ 526,929 | $ 487,467 | $ 479,415 | $ 503,378 | $ 696,901 | $ 456,913 | $ 2,100,802 | $ 2,136,606 | $ 1,753,250
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 210,023 | 233,155 | 219,595 | 217,635 | 208,485 | 208,509 | 306,263 | 191,897 | 880,408 | 915,153 | 794,642
Gross profit | 309,535 | 333,693 | 307,334 | 269,832 | 270,930 | 294,869 | 390,638 | 265,016 | 1,220,394 | 1,221,453 | 958,608
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Selling and administrative | 100,552 | 100,202 | 99,410 | 90,505 | 87,880 | 86,130 | 90,111 | 84,792 | 390,669 | 348,913 | 316,544
Engineering and development | 74,706 | 77,049 | 75,342 | 74,408 | 72,070 | 76,986 | 82,270 | 75,978 | 301,505 | 307,305 | 292,159
Acquired intangible assets amortization | 10,558 | 11,142 | 9,793 | 7,698 | 7,384 | 7,028 | 8,166 | 7,952 | 39,191 | 30,530 | 52,648
Restructuring and other | 11,446 | 1,710 | 2,389 | (313) | 8,970 | (4,407) | 2,288 | 2,511 | 15,232 | 9,362 | 21,942
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | 254,946
Acquired intangible assets impairment |  |  |  |  |  |  |  |  | 8,800 |  | 83,339
Total operating expenses | 197,262 | 190,103 | 186,934 | 172,298 | 176,304 | 165,737 | 182,835 | 171,233 | 746,597 | 696,110 | 1,021,578
Income (loss) from operations | 112,273 | 143,590 | 120,400 | 97,534 | 94,626 | 129,132 | 207,803 | 93,783 | 473,797 | 525,343 | (62,970)
Non-operating (income) expenses: |  |  |  |  |  |  |  |  |  |  |
Interest income | (9,083) | (6,213) | (5,427) | (5,981) | (6,476) | (4,517) | (3,292) | (3,520) | (26,704) | (17,805) | (9,296)
Interest expense | 13,182 | 5,557 | 5,639 | 6,890 | 5,380 | 5,372 | 5,509 | 5,402 | 31,269 | 21,663 | 3,637
Other (income) expense, net | (2,954) | 3,405 | 176 | 805 | (2,362) | 840 | (1,291) | (115) | 1,431 | (2,927) | (2,251)
Income (loss) before income taxes | 111,128 | 140,841 | 120,012 | 95,820 | 98,084 | 127,437 | 206,877 | 92,016 | 467,801 | 524,412 | (55,060)
Income tax provision (benefit) | (32,662) | 20,863 | 18,975 | 8,846 | 204,007 | 24,017 | 31,901 | 6,795 | 16,022 | 266,720 | (11,639)
Net income (loss) | $ 143,790 | $ 119,978 | $ 101,037 | $ 86,974 | $ (105,923) | $ 103,420 | $ 174,976 | $ 85,221 | $ 451,779 | $ 257,692 | $ (43,421)
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.80 | $ 0.65 | $ 0.53 | $ 0.45 | $ (0.54) | $ 0.52 | $ 0.88 | $ 0.43 | $ 2.41 | $ 1.30 | $ (0.21)
Diluted | 0.79 | 0.63 | 0.52 | 0.43 | (0.54) | 0.52 | 0.87 | 0.42 | $ 2.35 | $ 1.28 | $ (0.21)
Weighted average common shares-basic |  |  |  |  |  |  |  |  | 187,672 | 198,069 | 202,578
Weighted average common shares-diluted |  |  |  |  |  |  |  |  | 192,605 | 201,641 | 202,578
Cash dividend declared per common share | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.36 | $ 0.28 | $ 0.24
Product [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 420,652 | $ 470,994 | $ 434,051 | $ 403,925 | $ 388,282 | $ 412,854 | $ 610,356 | $ 373,204 | $ 1,729,621 | $ 1,784,695 | $ 1,453,248
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 170,064 | 195,339 | 180,777 | 180,958 | 168,672 | 169,661 | 267,752 | 154,883 | 727,138 | 760,967 | 660,056
Service [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total revenues | 98,906 | 95,854 | 92,878 | 83,542 | 91,133 | 90,524 | 86,545 | 83,709 | 371,181 | 351,911 | 300,002
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | $ 39,959 | $ 37,816 | $ 38,818 | $ 36,677 | $ 39,813 | $ 38,848 | $ 38,511 | $ 37,014 | $ 153,270 | $ 154,186 | $ 134,586
[1] | Restructuring and other includes a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] | Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[4] | Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[5] | Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[6] | Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[7] | Teradyne recorded pension and post retirement net actuarial gains of $2.8 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[8] | Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[9] | Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[10] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.

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