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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Increase decrease in stockholders equity roll forward        
Total Equity     $ 2,316,244  
Net income (loss) $ 87,351 $ 82,986 165,891 $ (132,988)
Other comprehensive income (loss) 448 315 392 (743)
Dividends declared on preferred stocks     (171) (514)
Dividends declared on common stock     (112,788) (109,858)
Stock-based compensation     2,390 2,955
Repurchase of common stock     (1,684)  
Total Parent equity $ 2,353,917 $ 2,285,061 2,353,917 $ 2,285,061
Common stock [Member]        
Increase decrease in stockholders equity roll forward        
Redemption of preferred stock     (757)  
Preferred stock [Member]        
Increase decrease in stockholders equity roll forward        
Redemption of preferred stock     $ (15,600)