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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Revenues | $ 859,634 | $ 796,392 | $ 763,520
Cost of sales | 390,524 | 365,351 | 355,190
Gross profit | 469,110 | 431,041 | 408,330
Selling and administrative expense | 355,617 | 351,799 | 338,400
Research and development expense | 42,188 | 32,307 | 32,254
Total operating expenses | 397,805 | 384,106 | 370,654
Income from operations | 71,305 | 46,935 | 37,676
Other expense | 0 | 0 | 2,942
Interest expense | 20,652 | 18,203 | 15,359
Income before income taxes | 50,653 | 28,732 | 19,375
Provision (benefit) for income taxes | 9,799 | (26,755) | 4,711
Net income | $ 40,854 | $ 55,487 | $ 14,664
Earnings per share: |  |  |
Basic (in dollars per share) | $ 1.45 | $ 1.99 | $ 0.53
Diluted (in dollars per share) | $ 1.41 | $ 1.97 | $ 0.52
Other comprehensive income (loss), before tax: |  |  |
Foreign currency translation adjustments | $ (8,369) | $ 13,879 | $ (4,501)
Pension liability | (885) | 1,023 | (755)
Cash flow hedging gain (loss) | 10,985 | (8,051) | 547
Other comprehensive income, before tax | 42,585 | 62,338 | 9,955
Provision (benefit) for income taxes related to items of other comprehensive income | 2,441 | (2,597) | (77)
Comprehensive income | $ 40,144 | $ 64,935 | $ 10,032

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration