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Employee Benefits and Share-Based Compensation - Stock Purchase Plan (Details) - USD ($) shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 19, 2009 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares added to reserved for future issuance (in shares) | 2,600 |
Shares reserved for future issuance (in shares) |  | 9,907
1997 Employee Stock Purchase Plan | Employee Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum percentage of earnings allowed for purchase of shares |  | 15.00%
Maximum fair market value of shares |  | $ 25
Purchase price of common stock, percent |  | 85.00%
Shares added to reserved for future issuance (in shares) | 3,000 |
Shares reserved for future issuance (in shares) |  | 2,831
Share of common stock purchased |  | 400
Shares issued for the 1997 Employee Stock Purchase Plan |  | 5,500
Unrecognized compensation cost |  | $ 3,500
Weighted average period of compensation cost recognized |  | 14 months 30 days

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: 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 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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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