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Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |  |  |
Employee contribution limit per calendar year to 401 (k) Plan (as a percent of compensation) | 60.00% |  |
Employer match of employee contributions of first 6% of eligible compensation (as a percent) | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2.0 | $ 2.1 | $ 1.9

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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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