Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Public Offering (Details)

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Stockholders' Equity Public Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 22, 2019
Jul. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 21, 2019
Class of Stock [Line Items]          
Proceeds from issuance of common stock, net of offering costs $ 284,500   $ 335,278 $ 76  
Issuance costs incurred in common stock offering $ 300        
Common Stock [Member]          
Class of Stock [Line Items]          
Number of shares of stock issued during period (in shares) 18,000,000 72,600,000 24,377,530 4,921  
Price per share of common stock issued during period (in usd per share)         $ 13.76
Over-Allotment Option [Member] | Common Stock [Member]          
Class of Stock [Line Items]          
Number of shares of stock issued during period (in shares) 2,700,000