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Stockholders' Equity Stockholders' Equity (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 17, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 80,000,000 |  |  |  | 80,000,000 |  |  |  |  |  | 80,000,000 | 80,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 | $ 0.01 |
Common stock, shares issued (in shares) |  | 22,622,242 |  |  |  | 22,490,855 |  |  |  |  |  | 22,622,242 | 22,490,855 |
Common stock, shares outstanding (in shares) |  | 22,622,242 |  |  |  | 22,490,855 |  |  |  |  |  | 22,622,242 | 22,490,855 |
Treasury stock, shares (in shares) |  | 6,523,370 |  |  |  | 5,849,316 |  |  |  |  |  | 6,523,370 | 5,849,316 |
Stock options awarded (in shares) |  |  |  |  |  |  |  |  |  |  |  | 462,000 | 236,000 | 653,000
Grants, weighted average exercise price (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 26.56 | $ 20.06 | $ 22.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period |  |  |  |  |  |  |  |  |  |  |  | 19,000 | 187,000 | 229,000
Shares purchased through Employee Stock Purchase Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  | 43,808 | 44,774 | 44,074
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 22.43 | $ 19.48 | $ 17.17
Share-Based Compensation Arrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By EBITDA |  |  |  |  | 50.00% |  |  |  | 25.00% |  |  |  |  |
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance |  |  |  |  | 50.00% |  |  |  | 75.00% |  |  |  |  |
Dividends declared per share (in dollars per share) |  | $ 0.075 | $ 0.05 | $ 0.050 | $ 0.050 |  |  |  |  |  |  | 0.225 | 0.15 | $ 0.10
Dividends declared, common stock, amount |  | $ 1,206,000 | $ 835,000 | $ 835,000 | $ 833,000 | $ 830,000 | $ 831,000 | $ 415,000 | $ 415,000 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  | $ 0.050 | $ 0.050 | $ 0.025 | $ 0.025 |  |  | $ 0.075 | $ 0.05 |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of all options granted |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Stock options awarded (in shares) |  |  |  |  |  |  |  |  |  |  |  | 461,700 | 235,500 | 628,000
Grants, weighted average exercise price (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 26.56 |  |
Incremental award vesting percentage |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Stock option, contracted term |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Value of stock options granted |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 | $ 1,300,000 | $ 3,700,000
Intrinsic value of outstanding stock options |  | 9,800,000 |  |  |  |  |  |  |  |  |  | 9,800,000 |  |
Intrinsic value of exercisable stock options |  | 8,600,000 |  |  |  |  |  |  |  |  |  | 8,600,000 |  |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,200,000 | 1,100,000
Total fair value of stock options vested |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 2,800,000 | 1,800,000
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 1,700,000 | 2,400,000
Unrecognized share based compensation cost |  | 3,000,000 |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Employee Stock Option | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of all options granted |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Employee Stock Option | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of all options granted |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 244,000 | 234,000 | 197,000
Purchase price percentage of grant date price per share (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 | $ 700,000 | $ 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  |
Unrecognized share based compensation cost |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |
Awards (in shares) |  |  |  |  |  |  |  |  |  |  |  | 27,000 |  |
Awards ( in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 27.53 |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Vesting percentage per period |  |  |  |  |  |  |  |  |  |  |  | 33.33% |  |
Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Vesting percentage per period |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards (in shares) |  |  |  |  |  |  |  |  |  | 27,250 |  |  | 16,900 | 37,900
Awards granted, aggregate grant date market value |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 | $ 300,000 | $ 900,000
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards (in shares) |  |  |  |  |  |  |  |  | 73,700 |  |  | 105,540 |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  | $ 2,800,000 |  |
Awards ( in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 26.56 |  |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 | 200,000 |
Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 400,000 | $ 700,000
Audit Committee Chairman |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director compensation, annual cash retainer | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Director Compensation, Quarterly Installment Of Annual Cash Retainer | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Director |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director compensation, annual cash retainer | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Director Compensation, Quarterly Installment Of Annual Cash Retainer | 18,750 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Governance Committee Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director compensation, annual cash retainer | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Director Compensation, Quarterly Installment Of Annual Cash Retainer | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |
New Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Director compensation, annual cash retainer | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental award vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental award vesting percentage |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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=84159872&loc=d3e21463-112644 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: 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=27012166&loc=d3e187085-122770 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: 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=84159872&loc=d3e21463-112644 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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=27012166&loc=d3e187085-122770 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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