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Stockholders' Equity Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 01, 2016 $ / shares | Sep. 01, 2016 $ / shares | Aug. 09, 2016 shares | Jun. 01, 2016 $ / shares | May 17, 2016 USD ($) | Mar. 01, 2016 $ / shares | Sep. 28, 2015 shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 $ / shares shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2016 | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) quarterly_dividend $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  | 80,000,000 |  |  |  |  |  | 80,000,000 | 80,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 | $ 0.01 |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  |  | 22,490,855 |  |  |  |  |  | 22,490,855 | 22,497,873 |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  | 22,490,855 |  |  |  |  |  | 22,490,855 | 22,497,873 |
Treasury stock, shares (in shares) | shares |  |  |  |  |  |  |  | 5,849,316 |  |  |  |  |  | 5,849,316 | 5,849,316 |
Stock options awarded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 236,000 | 653,000 | 804,000
Grants, weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.06 | $ 22.66 | $ 20.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | shares |  |  |  |  |  |  |  |  | 146,100 |  |  |  |  | 187,000 | 229,000 | 121,000
Shares purchased through Employee Stock Purchase Plan (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,774 | 44,074 | 55,877
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.48 | $ 17.17 | $ 15.50
Share-Based Compensation Arrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By EBITDA |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Dividends declared per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.05 | $ 0.05 | $ 0.025 | $ 0.025 |  |  | $ 0.15 | $ 0.10 | $ 0.10
Dividends declared, common stock, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 | $ 1,800,000 |
Common Stock, Dividends, Per Share, Cash Paid | $ / shares | $ 50.00 | $ 0.05 |  | $ 0.025 |  | $ 0.025 |  |  |  |  |  |  |  | $ 0.05 | $ 0.025 |
Number Of Quarterly Dividends Paid | quarterly_dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Common Stock, Quarterly Dividends, Per Share, Cash Paid | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.025 |
Number Of Quarterly Dividends Declared | quarterly_dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Common Stock, Quarterly Dividends, Per Share, Declared | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.025 |
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) | shares |  |  |  |  |  |  |  |  |  |  |  | 235,500 |  |  | 628,000 | 803,700
Grants, weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 20.06 |  |  |  |
Incremental award vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Stock option, contracted term |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Value of stock options granted |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  | $ 3,700,000 | $ 4,100,000
Intrinsic value of outstanding stock options |  |  |  |  |  |  |  | $ 15,607,000 |  |  |  |  |  | $ 15,607,000 |  |
Intrinsic value of exercisable stock options |  |  |  |  |  |  |  | 11,537,000 |  |  |  |  |  | 11,537,000 |  |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 1,100,000 | 953,000
Total fair value of stock options vested |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,786,000 | 1,808,000 | 752,000
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,721,000 | 2,431,000 | 1,594,000
Decrease in Share-based Compensation Expense, Cancellation Of Options |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |
Decrease In Allocated Share-Based Compensation Expense, Full Vesting Of Grant |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |
Unrecognized share based compensation cost |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  | $ 1,500,000 |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 234,000 | 197,000 | 260,000
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 | 1,500,000 | 1,800,000
Unrecognized share based compensation cost |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  | $ 1,100,000 |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 91,000 |  |
Awards granted | shares |  |  |  |  |  |  |  |  |  |  |  | 16,900 |  | 17,960 |  |
Awards granted, aggregate grant date market value |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards granted | shares |  |  |  |  |  |  |  |  | 14,200 |  | 73,700 |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |
Executive Officer [Member] | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 221,000 |  |
Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) | shares |  |  | 1,061 |  |  |  | 25,000 |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 700,000 | $ 800,000
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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 + Details
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