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Stock Compensation (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value | $ 2,900,000 | $ 4,800,000 | $ 5,000,000 |
Employees purchased common stock, shares | 90,000 | 78,000 | 111,000 |
Capitalized stock compensation expense | $ 274,000 | $ 237,000 | $ 261,000 |
ESPP Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
ESPP, percentage of market price for eligible employees | 85.00% |  |  |
RSAs, RSUs, And PSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized awards from approved stock incentive plans |  | 405,000 | 655,000 |
Aggregate grant date market value |  | $ 4,300,000 | $ 6,600,000 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants of stock options | 387,000 | 328,000 | 562,000 |
Unrecognized compensation costs | $ 1,800,000 |  |  |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year 7 months 6 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 | 490,000 |  |  |
Aggregate grant date market value | $ 5,500,000 |  |  |
Unrecognized compensation costs | $ 5,100,000 |  |  |
Restricted Stock Awards (RSAs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized awards from approved stock incentive plans | 216,000 | 207,000 | 232,000 |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year 3 months 18 days |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized awards from approved stock incentive plans | 146,000 | 88,000 | 5,000 |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 2 years 1 month 6 days |  |  |
Performance Stock Units (PSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized awards from approved stock incentive plans | 144,000 | 125,000 | 185,000 |
Percentage of target number of shares of common stock granted as Performance Stock Units | 142.00% | 127.00% |  | 50.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 9 months 18 days |  |  |
Performance Stock Awards (PSAs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized awards from approved stock incentive plans |  |  | 250,000 |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 8 months 12 days |  |  |
Minimum [Member] | Performance Stock Units (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 | 60.00% |  |  |
Maximum [Member] | Performance Stock Units (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% |  |  |

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