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Stock-Based Compensation (Summary Of Stock Option And Restricted Stock Awards Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Outstanding |  |  |
Outstanding at beginning | 240,308 |  |
Granted | 83,513 | 45,000 | 40,500
Exercised | (55,642) | (31,760) | (24,541)
Cancelled | (38,744) |  |
Outstanding at ending | 229,435 | 240,308 |
Weighted Average Exercise Price |  |  |
Outstanding at beginning, Weighted Average Exercise Price | $ 22.21 |  |
Granted, Weighted Average Exercise Price | 33.27 |  |
Exercised, Weighted Average Exercise Price | 21.69 |  |
Cancelled, Weighted Average Exercise Price | 22.37 |  |
Outstanding at ending, Weighted Average Exercise Price | $ 26.33 | $ 22.21 |
Vested and Expected to Vest |  |  |
Vested and expected to vest, Outstanding | 226,219 |  |
Vested and expected to vest, Weighted Average Exercise Price | $ 26.45 |  |
Vested and expected to vest, Aggregate Intrinsic Value | $ 1,807 |  |
Exercisable, Outstanding | 68,104 |  |
Exercisable, Weighted Average Exercise Price | $ 21.30 |  |
Exercisable, Aggregate Intrinsic Value | $ 895 |  |
Aggregate Intrinsic Value |  |  |
Outstanding, Options, Aggregate Intrinsic Value | $ 1,860 |  |
Restricted Stock Awards [Member] |  |  |
Number of Outstanding |  |  |
Outstanding at beginning |  |  |
Granted | 2,860 |  |
Exercised | (2,860) |  |
Cancelled |  |  |
Outstanding at ending |  |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning, Weighted Average Exercise Price |  |  |
Granted, Weighted Average Exercise Price | $ 34.81 |  |
Exercised, Weighted Average Exercise Price | $ 34.81 |  |
Cancelled, Weighted Average Exercise Price |  |  |
Outstanding at ending, Weighted Average Exercise Price |  |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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