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Stockholders' Equity
 6 Months Ended
Jun. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity
Stockholders’ Equity
Treasury Stock
On February 22, 2017, the Company purchased 1.85 million shares of common stock for a total of $68.3 million from the underwriters of a secondary offering of shares of our common stock by certain of our stockholders. On May 2, 2017, the Company purchased an additional 1.65 million shares of common stock for a total of $65.2 million from the underwriters of a secondary offering of shares of our common stock by certain of our stockholders.
Preferred Stock
We have 100.0 million shares of preferred stock authorized. No preferred stock had been issued or was outstanding as of June 30, 2017.