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Equity - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 29, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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         $ 198,333,000 $ 177,000  
Issuance of common stock $ 177,000,000 $ 12,511,000     190,108,000    
Direct stock purchase and dividend reinvestment plan   0     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)   8,996   7,091 8,186 6,965  
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 1,550,819   791,191    
Net proceeds from issuance of common stock   $ 13,000,000 $ 25,000,000   $ 13,000,000    
Remaining outstanding   $ 112,000,000     $ 112,000,000    
Common Stock              
Stockholders Equity Note [Line Items]              
Issuance of common stock (in shares)   791,191     12,291,191    
Issuance of common stock   $ 8,000     $ 123,000    
Direct stock purchase and dividend reinvestment plan (in shares)   0     399,838    
Direct stock purchase and dividend reinvestment plan   $ 0     $ 4,000