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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Common stock, authorized shares (in shares) |  | 500,000,000 | 500,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01 |
Common stock, issued shares (in shares) |  | 77,307,521 | 76,610,508 |
Common stock, outstanding shares (in shares) |  | 77,307,521 | 76,610,508 |
Shares issued under underwritten public offering (in shares) | 14,123,150 |  |  |
Shares exercised in full of over-allotment option by underwriter (in shares) | 1,842,150 |  |  |
Shares price (in dollars per share) | $ 28.50 |  |  |
Underwriter's discount and offering expenses | $ 24,800 |  |  |
Net proceeds from the sale of shares | $ 377,700 | $ 0 | $ 377,656 | $ 0
Preferred stock, authorized (in shares) |  | 200,000,000 | 200,000,000 |
Preferred stock, par value (in shares) |  | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  | 0 | 0 |
Preferred stock, shares outstanding (in shares) |  | 0 | 0 |
Stock options to purchase common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock shares reserved for issuance (in shares) |  | 9,381,730 |  |
Restricted stock and restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock shares reserved for issuance (in shares) |  | 227,826 |  |

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