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Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders' Equity Common Stock—As of December 31, 2018, the Company had 500,000,000 shares of common stock authorized with a par value of $0.01 and 77,307,521 shares of common stock issued and outstanding. In addition, as of December 31, 2018, the Company had reserved 9,381,730 shares of common stock for issuance upon the exercise of outstanding common stock options and 227,826 shares of common stock for issuance upon the vesting of restricted stock units. In September 2017, the Company completed an underwritten public offering of 14,123,150 shares of the Company’s common stock, which included the underwriter’s exercise in full of its over-allotment option of 1,842,150 shares, at a price to the public of $28.50 per share.  The Company’s net proceeds from the sale of the shares, after deducting underwriting discounts and offering expenses of $24.8 million, were approximately $377.7 million. Preferred Stock—As of December 31, 2018 and 2017, the Company had 200,000,000 shares of preferred stock authorized with a par value of $0.01 and no shares of preferred stock were issued and outstanding.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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