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Stock-Based Compensation and Stock Repurchases (Summary of Restricted Stock Units Granted) (Details) - Restricted Stock Units (RSUs) [Member] | 3 Months Ended
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Mar. 31, 2017 shares
Options granted | 131,297
Vested | 41,993
Nonvested | 89,304
March 10, 2016 [Member] |
Options granted | 62,528
Vested | 41,993
Nonvested | 20,535
April 11, 2016 [Member] |
Options granted | 5,625
Nonvested | 5,625
March 23, 2017 [Member] |
Options granted | 63,144
Nonvested | 63,144
Director [Member] |
Options granted | 65,828
Director [Member] | March 10, 2016 [Member] |
Options granted | 35,147
Director [Member] | March 23, 2017 [Member] |
Options granted | 30,681
Management [Member] |
Options granted | 65,469
Management [Member] | March 10, 2016 [Member] |
Options granted | 27,381
Management [Member] | April 11, 2016 [Member] |
Options granted | 5,625
Management [Member] | March 23, 2017 [Member] |
Options granted | 32,463

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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