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Other Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Employee Benefit Plans [Abstract] |  |  |
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2016 | $ 18,000 |  |
Percentage of company matching contribution to 401(K) plan | 50.00% |  |
Defined contribution plan employer matching contribution percent | 3.00% |  |
Company's contributions to 401(K) plan | $ 1,100,000 | $ 1,100,000 | $ 900,000
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan | 90.00% |  |
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation | 10.00% |  |
Maximum number of shares available for purchase by participating employees | 2,500,000 |  |

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- Definition Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation. + References No definition available. + Details
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- Definition Employee stock purchase plan, percentage of purchase price from market value. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
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