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Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details) - shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Restricted stock awards |  |
Stock-based compensation |  |
Vesting period of shares awarded under the Program | 3 years |
Performance share awards |  |
Stock-based compensation |  |
Vesting period of shares awarded under the Program | 3 years |
Deferred Compensation Equity |  |
Performance share awards |  |
Number of common stock deferred (in shares) | 274,800 | 253,520

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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