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Stock Compensation (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) item shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of performance stock unit grants | item | 2 |  |
Percentage of target number of shares of common stock granted as Performance Stock Units |  | 80.00% |
Total fair value | $ | $ 9,800,000 | $ 7,300,000 | $ 11,100,000
Employees purchased common stock, shares | 61,000 | 83,000 | 93,000
Capitalized stock compensation expense | $ | $ 612,000 | $ 484,000 | $ 394,000
RSAs, RSUs, And PSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans |  | 328,000 | 426,000
Aggregate grant date market value | $ |  | $ 7,500,000 | $ 7,100,000
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grants of stock options | 169,000 | 219,000 | 260,000
Unrecognized compensation costs | $ | $ 2,000,000.0 |  |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year 4 months 24 days |  |
RSAs, RSUs, PSUs, And PSAs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans | 507,000 |  |
Aggregate grant date market value | $ | $ 15,000,000.0 |  |
Unrecognized compensation costs | $ | $ 11,900,000 |  |
Restricted Stock Awards (RSAs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans | 93,000 | 128,000 | 138,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans | 103,000 | 115,000 | 196,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year 6 months |  |
Performance Stock Units (PSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans | 322,000 | 104,000 | 126,000
Percentage of target number of shares of common stock granted as Performance Stock Units | 83.00% |  | 92.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 2 years 3 months 18 days |  |
Short-term PSUs [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Long-term PSUs [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Performance Stock Awards (PSAs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized awards from approved stock incentive plans |  |  |
Maximum [Member] | Short-term PSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target number of shares of common stock granted as Performance Stock Units | 150.00% |  |
Maximum [Member] | Long-term PSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target number of shares of common stock granted as Performance Stock Units | 288.00% |  |
Executive Officer [Member] | Maximum [Member] | Long-term PSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target number of shares of common stock granted as Performance Stock Units | 192.00% |  |
2009 Equity And Cash Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Increase in shares authorized under plan | 1,900,000 |  |

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