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Stockholders' Equity Additional Details (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |
Preferred Stock, Shares Authorized | 2,000,000 | 2,000,000 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 960,488 |
Stock Issued During Period, Value, Other |  |  |  | $ 62.26 |
Proceeds from issuance of common stock, net of expenses | $ 0 | $ (10,000) | [1] | $ 57,360,000 | [1]
[1] | On September 22, 2016, we completed a public offering of 960,488 shares of our common stock at a price per share of $62.26. The net proceeds from the sale of common stock, after deducting underwriting commissions and expenses, were approximately $57.4 million.

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