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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance at beginning of period (in shares)     50,334,000       50,334,000  
Balance at beginning of period $ 1,002,263 $ 929,802 $ 921,344 $ 782,023 $ 755,140 $ 779,906 $ 921,344 $ 779,906
Net income (loss) attributable to noncontrolling interests 70 (149)   0     (79) 0
Net income (loss) 62,429 38,225 (3,032) 96,360 5,281 (20,307) $ 97,622 81,334
Issuance of common stock 67,830 40,902 24,486 22,414 32,063 7,229    
Repurchase of common stock (69) (109) (1,415) (99) (105) (1,373)    
Dividends paid on common stock (11,863) (11,702) (11,581) (10,506) (10,356) (10,315)    
Acquisition of business with noncontrolling interest   5,294            
Investment in business with noncontrolling interest $ 0              
Balance at end of period (in shares) 52,608,000           52,608,000  
Balance at end of period $ 1,120,660 $ 1,002,263 $ 929,802 $ 890,192 $ 782,023 $ 755,140 $ 1,120,660 $ 890,192
Dividends paid on common stock (in dollars per share) $ 0.2300 $ 0.2300 $ 0.2300 $ 0.2125 $ 0.2125 $ 0.2125    
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance at beginning of period (in shares) 51,535,000 50,835,000 50,334,000 49,398,000 48,714,000 48,532,000 50,334,000 48,532,000
Balance at beginning of period $ 515 $ 508 $ 503 $ 494 $ 487 $ 485 $ 503 $ 485
Issuance of common stock (in shares) 1,075,000 702,000 528,000 444,000 686,000 210,000    
Issuance of common stock $ 11 $ 7 $ 5 $ 4 $ 7 $ 2    
Repurchase of common stock (in shares) (2,000) (2,000) (27,000) (2,000) (2,000) (28,000)    
Balance at end of period (in shares) 52,608,000 51,535,000 50,835,000 49,840,000 49,398,000 48,714,000 52,608,000 49,840,000
Balance at end of period $ 526 $ 515 $ 508 $ 498 $ 494 $ 487 $ 526 $ 498
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance at beginning of period 512,484 471,698 448,632 400,080 368,129 362,275 448,632 362,275
Issuance of common stock 67,819 40,895 24,481 22,410 32,056 7,227    
Repurchase of common stock (69) (109) (1,415) (99) (105) (1,373)    
Investment in business with noncontrolling interest 526              
Balance at end of period 580,760 512,484 471,698 422,391 400,080 368,129 580,760 422,391
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance at beginning of period 484,119 457,596 472,209 381,449 386,524 417,146 472,209 417,146
Net income (loss) 62,429 38,225 (3,032) 96,360 5,281 (20,307)    
Dividends paid on common stock (11,863) (11,702) (11,581) (10,506) (10,356) (10,315)    
Balance at end of period 534,685 484,119 457,596 $ 467,303 $ 381,449 $ 386,524 534,685 $ 467,303
Noncontrolling Interests                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance at beginning of period 5,145 0 0       0  
Net income (loss) attributable to noncontrolling interests 70 (149)            
Acquisition of business with noncontrolling interest   5,294            
Investment in business with noncontrolling interest (526)              
Balance at end of period $ 4,689 $ 5,145 $ 0       $ 4,689