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Capital Transactions (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended
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Aug. 29, 2013 | Sep. 30, 2013 Stock options | Sep. 30, 2013 Stock options Maximum | Sep. 30, 2013 Stock options Minimum | Sep. 30, 2013 Time-based stock options | Sep. 30, 2012 Time-based stock options | Sep. 30, 2013 Time-based stock options | Sep. 30, 2012 Time-based stock options | Dec. 31, 2012 Time-based stock options | Sep. 30, 2013 Time-based stock options Maximum | Sep. 30, 2013 Performance based stock options | Sep. 30, 2012 Performance based stock options | Sep. 30, 2013 Performance based stock options | Sep. 30, 2012 Performance based stock options | Dec. 31, 2012 Performance based stock options | Sep. 30, 2013 Performance based stock options operating income margins | Sep. 30, 2013 Performance based stock options sales and operating income margins | Sep. 30, 2013 Performance based stock options sales | Sep. 30, 2013 Performance based stock options sales Maximum | Sep. 30, 2013 2012 Stock Incentive Plan Stock options
Number of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  | 1,784 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited (in shares) |  | (152) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in shares) |  | (502) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  | 1,797 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  | $ 11.81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 15.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited (in dollars per share) |  | $ 13.71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in dollars per share) |  | $ 8.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in dollars per share) |  | $ 12.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in exercise price of all outstanding stock options (in dollars per share) |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | 48 months |  |  |  |  |  |  | 2 years |  |  |
Operating income margin, one (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Operating income margin, two (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Operating income margin, three (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Period of time during which operating income margins must be achieved in order to vest in performance based stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |
Consecutive period of time used to assess operating income margins which determine vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 months |  |  |  |
Vesting period based on achieving annual net sales targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.27
Expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 6 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.50% | 0.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility (as a percent) |  |  | 58.20% | 56.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield (as a percent) |  |  | 2.70% | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, related information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 0 |  |  | $ 620 | $ 630 | $ 2,423 | $ 1,299 |  |  | $ 0 | $ 0 | $ 0 | $ 652 |  |  |  |  |  |
Related tax benefits |  |  |  |  | 245 | 246 | 957 | 513 |  |  |  |  | 0 | 255 |  |  |  |  |  |
Unrecognized share-based compensation expense |  |  |  |  | 3,115 |  | 3,115 |  | 2,715 |  |  |  |  |  | 0 |  |  |  |  |
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |
Potential compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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