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Equity Incentive Plans and Benefit Plans - Employee Stock Purchase Plan Activity (Details) (USD $)
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0 Months Ended | |
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Sep. 01, 2014
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Sep. 01, 2013
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Shares issued | 565,396 | 432,749 |
| Weighted average purchase price per share | $ 14.64 | $ 14.12 |