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Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Schedule of changes in total common stockholders' equity
The Company’s changes in total common stockholders’ equity for the six months ended June 30, 2020 and 2019 were as follows:
Six months ended June 30, 2020
 Common StockAdditional
Paid-in
Capital		Retained
Earnings		Total
Stockholders'
Equity
 SharesAmount
 (In thousands)
Balance at January 1, 202048,532  $485  $362,275  $417,146  $779,906  
Net loss(20,307) (20,307) 
Issuance of common stock210  2  7,227  7,229  
Repurchase of common stock(28) —  (1,373) (1,373) 
Dividends paid on common stock ($0.2125 per share)
(10,315) (10,315) 
Balance at March 31, 202048,714  487  368,129  386,524  755,140  
Net income5,281  5,281  
Issuance of common stock686  7  32,056  32,063  
Repurchase of common stock(2) —  (105) (105) 
Dividends paid on common stock ($0.2125 per share)
(10,356) (10,356) 
Balance at June 30, 202049,398  494  400,080  381,449  782,023  
Six months ended June 30, 2019
 Common StockAdditional
Paid-in
Capital		Retained
Earnings		Total
Stockholders'
Equity
 SharesAmount
 (In thousands)
Balance at January 1, 201948,065  $481  $337,623  $392,053  $730,157  
Net loss(7,640) (7,640) 
Issuance of common stock109  —  3,179  3,179  
Repurchase of common stock(40) —  (2,074) (2,074) 
Dividends paid on common stock ($0.1975 per share)
(9,493) (9,493) 
Balance at March 31, 201948,134  481  338,728  374,920  714,129  
Net income16,996  16,996  
Issuance of common stock8  —  1,675  1,675  
Repurchase of common stock(2) —  (129) (129) 
Dividends paid on common stock ($0.1975 per share)
(9,507) (9,507) 
Balance at June 30, 201948,140  481  340,274  382,409  723,164