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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 21, 2018 | Feb. 15, 2018 | Jul. 18, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsequent Events |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement |  |  |  | 21,122,449 |  |  |
Price per share of common stock issued (in dollars per share) |  |  |  | $ 12.25 |  |  |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  |  |  | $ 258,800 | $ 243,037 |  | $ 243,042
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions |  |  | $ 243,000 |  | $ 243,037 | $ 97,068 | $ 243,042
Common Stock |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement |  |  |  | 21,122,449 | 21,122,449 |  | 19,528,302
Price per share of common stock issued (in dollars per share) |  |  |  | $ 12.25 |  |  |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  |  |  | $ 258,800 | $ 212 |  | $ 195
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions |  |  | $ 243,000 |  |  |  |
Subsequent event | Common Stock |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement |  | 19,354,839 |  |  |  |  |
Price per share of common stock issued (in dollars per share) |  | $ 15.50 |  |  |  |  |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  | $ 300,000 |  |  |  |  |
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions | $ 282,000 |  |  |  |  |  |

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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