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Equity - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 03, 2019
Jan. 29, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Feb. 28, 2018
Stockholders Equity Note [Line Items]                
Issuance of common stock (in shares) 14,375,000 11,500,000            
Net proceeds from issuance of common stock         $ 426,970,000 $ 117,311,000    
Issuance of common stock $ 228,000,000 $ 177,000,000 $ 228,483,000 $ 117,036,000 418,591,000 $ 117,036,000    
Direct stock purchase and dividend reinvestment plan         6,307,000      
Share Repurchase Plan, February 2018                
Stockholders Equity Note [Line Items]                
Common stock authorized to repurchase by Board               $ 100,000,000
Available authorization remaining for repurchase     $ 100,000,000   $ 100,000,000      
Equity awards                
Stockholders Equity Note [Line Items]                
Securities excluded in the calculation of diluted earnings per share (in shares)     11,710 7,761 9,361 7,230    
At The Market Offerings | Common Stock                
Stockholders Equity Note [Line Items]                
Stock issuance program, authorized amount             $ 150,000,000  
Issuance of common stock (in shares)         791,191      
Net proceeds from issuance of common stock         $ 13,000,000      
Remaining outstanding     $ 112,000,000   $ 112,000,000      
Common Stock                
Stockholders Equity Note [Line Items]                
Issuance of common stock (in shares)     14,375,000 7,187,500 26,666,191 7,187,500    
Issuance of common stock     $ 144,000 $ 72,000 $ 267,000 $ 72,000    
Direct stock purchase and dividend reinvestment plan (in shares)         399,838      
Direct stock purchase and dividend reinvestment plan         $ 4,000