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Stock Plans - ESPP and Treasury Stock (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2012 | Dec. 31, 2016 | Feb. 04, 2016
Share Repurchase Program 2016 |  |  |
Employee Stock Purchase Plan |  |  |
Amount authorized to be purchased under stock repurchase program |  |  | $ 100,000,000
Number of shares repurchased under program (in shares) |  | 1,300,000 |
Value of shares repurchased under program |  | $ 40,000,000 |
ESPP Plan |  |  |
Employee Stock Purchase Plan |  |  |
Term of Employee Stock Purchase Plan | 10 years |  |
Total number of shares available for purchase (in shares) | 500,000 |  |
ESPP participation period | 6 months |  |
Percentage of fair market value of common stock | 85.00% |  |
Maximum percentage of total combined voting power a participant is allowed to be granted a right to purchase common stock | 5.00% |  |
Maximum number of shares authorized for purchase within any purchase period (in shares) | 1,000 |  |
Maximum value of shares authorized for purchase within any purchase period | $ 25,000 |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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