XML 58 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Quarterly Results of Operations (UNAUDITED) (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial information |
(Dollars in thousands, except per share amounts) | 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales | $ | 203,828 |  |  | $ | 201,424 |  |  | $ | 206,783 |  |  | $ | 209,008 |
Gross margin | $ | 80,350 |  |  | $ | 80,546 |  |  | $ | 82,188 |  |  | $ | 75,491 |
Net income | $ | 27,032 |  |  | $ | 20,896 |  |  | $ | 25,532 |  |  | $ | 6,999 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 1.50 |  |  | $ | 1.15 |  |  | $ | 1.40 |  |  | $ | 0.38 |
Diluted | $ | 1.47 |  |  | $ | 1.13 |  |  | $ | 1.37 |  |  | $ | 0.37 |

X
- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
Name: | us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration