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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The following table presents the impact of ASC 606 on Consolidated Statements of Operations and Comprehensive Income:
| Year Ended December 31, 2018
(Dollars in thousands) | As Reported |  | Service Revenues and Costs Adjustments |  | Pro-Forma as if Previous Accounting Guidance Was in Effect (Unaudited)
Product revenue | $ | 310,204 |  |  | $ | 39,383 |  |  | $ | 349,587 |
Service revenue | 39,433 |  |  | (39,433 | ) |  | — |
Total revenue | 349,637 |  |  | (50 | ) |  | 349,587 |
Product cost of goods sold | 145,493 |  |  | — |  |  | 145,493 |
Service costs | 14,604 |  |  | (14,604 | ) |  | — |
Total cost of goods sold | 160,097 |  |  | (14,604 | ) |  | 145,493 |
Gross profit | 189,540 |  |  | 14,554 |  |  | 204,094 |
Gross profit percentage | 54.2 | % |  |  |  | 58.4 | %
Selling expenses | 87,642 |  |  | 14,498 |  |  | 102,140 |
General and administrative expenses | 92,688 |  |  | — |  |  | 92,688 |
Operating expenses | 180,330 |  |  | 14,498 |  |  | 194,828 |
Operating income as reported was $9.21 million whereas pro forma unaudited operating income as if previous accounting guidance was in effect would have been $9.27 million.
Disaggregation of Revenue | Disaggregated revenue by geographic area follows:
| Unaudited
| Year Ending December 31,
(Dollars in thousands) | 2018 |  | 2017
United States | $ | 279,917 |  |  | $ | 266,994 |
Canada | 69,720 |  |  | 38,913 |
Consolidated total | $ | 349,637 |  |  | $ | 305,907 |
Disaggregated revenue by product type follows:
| Unaudited
| Year Ending December 31,
| 2018 |  | 2017
Fastening Systems | 24 | % |  | 21 | %
Cutting Tools and Abrasives | 15 | % |  | 14 | %
Fluid Power | 14 | % |  | 15 | %
Specialty Chemicals | 12 | % |  | 14 | %
Electrical | 11 | % |  | 11 | %
Aftermarket Automotive Supplies | 8 | % |  | 9 | %
Safety | 5 | % |  | 4 | %
Welding and Metal Repair | 2 | % |  | 2 | %
Other | 9 | % |  | 10 | %
Consolidated Total | 100 | % |  | 100 | %

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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