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Stockholders' Equity - Nonqualified Cash Plan and Equity Incentive Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity |  |
Deferred compensation investment | $ 2.7 | $ 2.2
2007 Plan and 2007 Director Plan |  |
Stockholders' Equity |  |
Award term | P10Y |
Vesting percentage | 100.00% |
2007 Plan and 2007 Director Plan | First Anniversary |  |
Stockholders' Equity |  |
Vesting percentage | 25.00% |
Maximum | 2007 Plan and 2007 Director Plan | Options to purchase common stock |  |
Stockholders' Equity |  |
Number of shares reserved for issuance |  | 9,457,741

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