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Stockholders' Equity Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Dec. 02, 2019 shares | Nov. 04, 2019 shares | Aug. 01, 2019 shares | Feb. 20, 2019 shares | Nov. 29, 2018 USD ($) | May 15, 2018 | Oct. 25, 2017 $ / shares | Oct. 24, 2017 $ / shares | Dec. 31, 2019 USD ($) director plan $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Mar. 31, 2016 | Dec. 31, 2019 USD ($) director plan $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | May 16, 2018 USD ($)
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 | 80,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 25,880,362 |  |  |  | 25,703,490 |  |  |  |  | 25,880,362 | 25,703,490 |  |
Treasury Stock, Shares | shares |  |  |  |  |  |  |  |  | 8,025,339 |  |  |  | 7,625,339 |  |  |  |  | 8,025,339 | 7,625,339 |  |
Stock options awarded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 213,000 | 462,000 |
Number Of Directors | director |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |
Grants, weighted average exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.35 | $ 25.43 | $ 26.56 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 298,000 | 165,000 | 19,000 |
Unrecognized share based compensation cost |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |  |
Shares purchased through Employee Stock Purchase Plan (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,731 | 49,938 | 43,808 |
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.18 | $ 18.56 | $ 22.43 |
Dividends declared per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.075 | $ 0.05 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 |  |  |  |  |  | $ 0.300 | $ 0.300 | $ 0.225 |
Dividends declared, common stock, amount |  |  |  |  |  |  |  |  | $ 1,337,000 | $ 1,336,000 | $ 1,365,000 | $ 1,360,000 | $ 1,437,000 | $ 1,436,000 | $ 1,433,000 | $ 1,207,000 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Number of Stock Benefit Plans | plan |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |
Contractual term of all options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |
Stock options awarded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 212,940 | 461,700 |
Grants, weighted average exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.35 | $ 25.43 | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 1,400,000 | $ 3,300,000 |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 3,900,000 | 1,000,000 |
Total fair value of stock options vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 | 1,500,000 | 1,500,000 |
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 1,000,000 | 1,500,000 |
Unrecognized share based compensation cost |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |
Unrecognized share based compensation, expected term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 7 days |  |  |
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 Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | 200,000 | 200,000 |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellations ( in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.84 |  |  |
Share based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 | $ 800,000 | $ 700,000 |
Cancellations (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,000) |  |  |
Awards (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000 |  |  |
Awards ( in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.94 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Awards (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,550 | 86,260 | 27,250 |
Awards granted, aggregate grant date market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 2,200,000 | $ 800,000 |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards (in shares) | shares | 35,000 | 9,123 | 14,000 | 248,500 |  |  |  |  |  |  |  |  |  |  |  |  |  | 306,623 | 113,320 | 105,540 |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 | $ 2,900,000 | $ 2,800,000 |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 4,400,000 | 700,000 |
Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 500,000 | $ 400,000 |
Director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options awarded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,458 |  |  |
Value of stock options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
Cancellations ( in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.78 |  |  |
Director compensation, annual cash retainer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |
Director Compensation, Quarterly Installment Of Annual Cash Retainer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |
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, Quarterly Installment Of Annual Cash Retainer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |
Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per period |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per period |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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