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Stock-Based Compensation and Stock Repurchases (Summary of Restricted Stock Units Granted) (Details) - Restricted Stock Units (RSUs) [Member] | 6 Months Ended
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Jun. 30, 2017 shares
RSU Grants | 131,297
Vested | 43,398
Unvested | 87,899
March 10, 2016 [Member] |
RSU Grants | 62,528
Vested | 41,992
Unvested | 20,536
April 11, 2016 [Member] |
RSU Grants | 5,625
Vested | 1,406
Unvested | 4,219
March 23, 2017 [Member] |
RSU Grants | 63,144
Unvested | 63,144
Director [Member] |
RSU Grants | 65,828
Director [Member] | March 10, 2016 [Member] |
RSU Grants | 35,147
Director [Member] | March 23, 2017 [Member] |
RSU Grants | 30,681
Management [Member] |
RSU Grants | 65,469
Management [Member] | March 10, 2016 [Member] |
RSU Grants | 27,381
Management [Member] | April 11, 2016 [Member] |
RSU Grants | 5,625
Management [Member] | March 23, 2017 [Member] |
RSU Grants | 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 Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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