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Equity - Additional Information (Details) - USD ($)
 3 Months Ended
Jan. 29, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Feb. 28, 2018
Stockholders Equity Note [Line Items]          
Issuance of common stock (in shares) 11,500,000        
Net proceeds from issuance of common stock   $ 182,512,000   $ 88,000  
Issuance of common stock $ 177,000,000 177,597,000      
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      
Equity awards          
Stockholders Equity Note [Line Items]          
Securities excluded in the calculation of diluted earnings per share (in shares)   7,376   6,838  
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)     1,550,819    
Net proceeds from issuance of common stock     $ 25,000,000    
Remaining outstanding   $ 125,000,000      
Common Stock          
Stockholders Equity Note [Line Items]          
Issuance of common stock (in shares)   11,500,000      
Issuance of common stock   $ 115,000      
Direct stock purchase and dividend reinvestment plan (in shares)   399,838      
Direct stock purchase and dividend reinvestment plan   $ 4,000