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Stock Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employees purchased common stock, shares | 47 | 52 | 93 | 90 |
Capitalized stock compensation expense | $ 111 | $ 70 | $ 288 | $ 202 |
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 |  |  | 384 | 478 |
Aggregate grant date market value |  |  | $ 6,300 | $ 5,300 |
Unrecognized compensation costs | 6,800 |  | 6,800 |  |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs | $ 2,100 |  | $ 2,100 |  |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 1 year 8 months 12 days |  |
Restricted Stock Awards (RSAs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
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] |  |  |  |  |
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] |  |  |  |  |
Percentage of target number of shares of common stock granted as Performance Stock Units |  |  |  |  | 142.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 1 year |  |
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% | 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% | 150.00% |
Officers [Member] | Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants of stock options |  |  | 260 | 387 |

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