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Stockholders’ Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     $ 188,561 $ (103,660)  
Cumulative effect of accounting changes         $ (12,207)
Net income $ 48,214 $ 48,901 101,727 114,034  
Other comprehensive income (loss) (38,256) 54,510 (18,078) 80,818  
Dividends paid     (70,113) (69,527)  
Issuance of common stock     (3,126) (4,823)  
Conversion to common stock     0 0  
Stock-based compensation expense     9,153 12,531  
Balances, end of period 195,917 29,373 195,917 29,373  
Preferred stock          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     1 1  
Balances, end of period 1 1 1 1  
Preference stock          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     441 483  
Conversion to common stock     (26) (20)  
Balances, end of period 415 463 415 463  
Common stock          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     323,338 323,338  
Balances, end of period 323,338 323,338 323,338 323,338  
Additional paid-in capital          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     138,367 148,125  
Issuance of common stock     (24,267) (28,567)  
Conversion to common stock     (521) (398)  
Stock-based compensation expense     9,153 12,531  
Balances, end of period 122,732 131,691 122,732 131,691  
Retained earnings          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     5,229,584 5,107,734  
Cumulative effect of accounting changes         $ (12,207)
Net income     101,727 114,034  
Dividends paid     (70,113) (69,527)  
Balances, end of period 5,248,991 5,152,241 5,248,991 5,152,241  
Accumulated other comprehensive loss          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     (792,173) (940,133)  
Other comprehensive income (loss)     (18,078) 80,818  
Balances, end of period (810,251) (859,315) (810,251) (859,315)  
Treasury stock          
Increase (Decrease) in Stockholders' Equity          
Balances, beginning of period     (4,710,997) (4,743,208)  
Issuance of common stock     21,141 23,744  
Conversion to common stock     547 418  
Balances, end of period $ (4,689,309) $ (4,719,046) $ (4,689,309) $ (4,719,046)