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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Common Stock and Additional Paid-In Capital
Retained Earnings
Treasury Stock
AOCI, Net of Tax
Beginning balance at Dec. 31, 2017 $ 3,841,951   $ 1,755,495 $ 2,576,302 $ (452,327) $ (37,519)
Beginning balance (in shares) at Dec. 31, 2017   144,543,060        
Beginning balance at Dec. 31, 2017 3,841,951   1,755,495 2,576,302 (452,327) (37,519)
Beginning balance (in shares) at Dec. 31, 2017   144,543,060        
Increase (Decrease) in Stockholders' Equity            
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate [1] 0     6,656   (6,656)
Net income 359,381     359,381    
Other comprehensive income (loss) (27,677)         (27,677)
Net activity of common stock pursuant to various stock compensation plans and agreements (618)   14,543   (15,161)  
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)   361,569        
Cash dividends on common stock (58,593)     (58,593)    
Ending balance at Jun. 30, 2018 4,114,284   1,770,038 2,883,201 (467,488) (71,467)
Ending balance (in shares) at Jun. 30, 2018   144,904,629        
Increase (Decrease) in Stockholders' Equity            
Cumulative effect of a change in accounting principle [2] (160)     (545)   385
Beginning balance at Mar. 31, 2018 3,978,755   1,761,653 2,740,179 (467,273) (55,804)
Beginning balance (in shares) at Mar. 31, 2018   144,872,525        
Increase (Decrease) in Stockholders' Equity            
Net income 172,349     172,349    
Other comprehensive income (loss) (15,663)         (15,663)
Net activity of common stock pursuant to various stock compensation plans and agreements 8,170   8,385   (215)  
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)   32,104        
Cash dividends on common stock (29,327)     (29,327)    
Ending balance at Jun. 30, 2018 4,114,284   1,770,038 2,883,201 (467,488) (71,467)
Ending balance (in shares) at Jun. 30, 2018   144,904,629        
Beginning balance at Dec. 31, 2018 4,423,974   1,789,977 3,160,132 (467,961) (58,174)
Beginning balance (in shares) at Dec. 31, 2018   144,961,363        
Increase (Decrease) in Stockholders' Equity            
Net income 314,404     314,404    
Other comprehensive income (loss) 48,202         48,202
Warrants exercised 4,443   1,711   2,732  
Warrants exercised (in shares)   180,226        
Net activity of common stock pursuant to various stock compensation plans and agreements 3,205   17,374   (14,169)  
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)   404,980        
Cash dividends on common stock (74,303)     (74,303)    
Ending balance at Jun. 30, 2019 4,734,593   1,809,062 3,414,901 (479,398) (9,972)
Ending balance (in shares) at Jun. 30, 2019   145,546,569        
Beginning balance at Mar. 31, 2019 4,591,930   1,799,124 3,305,054 (479,265) (32,983)
Beginning balance (in shares) at Mar. 31, 2019   145,501,301        
Increase (Decrease) in Stockholders' Equity            
Net income 150,380     150,380    
Other comprehensive income (loss) 23,011         23,011
Net activity of common stock pursuant to various stock compensation plans and agreements 9,805   9,938   (133)  
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)   45,268        
Cash dividends on common stock (40,533)     (40,533)    
Ending balance at Jun. 30, 2019 $ 4,734,593   $ 1,809,062 $ 3,414,901 $ (479,398) $ (9,972)
Ending balance (in shares) at Jun. 30, 2019   145,546,569        
[1]
Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018.
[2]
 
 
 
Common Stock and
Additional Paid-in Capital
 
Retained
Earnings
 
Treasury
Stock
 
AOCI,
Net of Tax
 
Total
Stockholders’
Equity
 
 
Shares
 
Amount
 
 
 
 
BALANCE, JANUARY 1, 2018
 
144,543,060

 
$
1,755,495

 
$
2,576,302

 
$
(452,327
)
 
$
(37,519
)
 
$
3,841,951

Cumulative effect of change in accounting principle related to marketable equity securities (1)
 
—

 
—

 
(545
)
 
—

 
385

 
(160
)
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate (2)
 
—

 
—

 
6,656

 
—

 
(6,656
)
 
—

Net income
 
—

 
—

 
359,381

 
—

 
—

 
359,381

Other comprehensive loss
 
—

 
—

 
—

 
—

 
(27,677
)
 
(27,677
)
Net activity of common stock pursuant to various stock compensation plans and agreements
 
361,569

 
14,543

 
—

 
(15,161
)
 
—

 
(618
)
Cash dividends on common stock ($0.40 per share)
 
—

 
—

 
(58,593
)
 
—

 
—

 
(58,593
)
BALANCE, JUNE 30, 2018
 
144,904,629

 
$
1,770,038

 
$
2,883,201

 
$
(467,488
)
 
$
(71,467
)
 
$
4,114,284

BALANCE, JANUARY 1, 2019
 
144,961,363

 
$
1,789,977

 
$
3,160,132

 
$
(467,961
)
 
$
(58,174
)
 
$
4,423,974

Cumulative effect of change in accounting principle related to leases (3)
 
—

 
—

 
14,668

 
—

 
—

 
14,668

Net income
 
—

 
—

 
314,404

 
—

 
—

 
314,404

Other comprehensive income
 
—

 
—

 
—

 
—

 
48,202

 
48,202

Warrants exercised
 
180,226

 
1,711

 
—

 
2,732

 
—

 
4,443

Net activity of common stock pursuant to various stock compensation plans and agreements
 
404,980

 
17,374

 
—

 
(14,169
)
 
—

 
3,205

Cash dividends on common stock ($0.505 per share)
 
—

 
—

 
(74,303
)
 
—

 
—

 
(74,303
)
BALANCE, JUNE 30, 2019
 
145,546,569

 
$
1,809,062

 
$
3,414,901

 
$
(479,398
)
 
$
(9,972
)
 
$
4,734,593