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Stock Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employees purchased common stock, shares | 36 | 45 |
Capitalized stock compensation expense | $ 106 |  |
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 | 273 | 239 |
Aggregate grant date market value | $ 5,900 | $ 4,000 |
Unrecognized compensation costs | 10,400 |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs | $ 3,100 |  |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 2 years 1 month 6 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 6 months |  |
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 2 months 12 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 |  |  | 90.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years | 1 year 6 months |  |
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 | 219 | 260 |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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