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CONSOLIDATED STATEMENTS 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 (in shares) at Dec. 31, 2014 |  | 143,582,229 |  |  |  |
Beginning balance at Dec. 31, 2014 | $ 2,856,111 |  | $ 1,677,931 | $ 1,604,141 | $ (430,198) | $ 4,237
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 292,872 |  |  | 292,872 |  |
Other comprehensive loss | (2,407) |  |  |  |  | (2,407)
Stock compensation costs | 11,702 |  | 11,702 |  |  |
Tax benefit from stock compensation plans, net | 3,227 |  | 3,227 |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  | 287,725 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements | (3,290) |  | 2,569 |  | (5,859) |
Common stock dividends | (87,100) |  |  | (87,100) |  |
Ending balance (in shares) at Sep. 30, 2015 |  | 143,869,954 |  |  |  |
Ending balance at Sep. 30, 2015 | 3,071,115 |  | 1,695,429 | 1,809,913 | (436,057) | 1,830
Beginning balance at Jun. 30, 2015 |  |  |  |  |  | 5,430
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 94,097 |  |  |  |  |
Other comprehensive loss | (3,600) |  |  |  |  | (3,600)
Tax benefit from stock compensation plans, net | 31 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2015 |  | 143,869,954 |  |  |  |
Ending balance at Sep. 30, 2015 | 3,071,115 |  | 1,695,429 | 1,809,913 | (436,057) | 1,830
Beginning balance (in shares) at Dec. 31, 2015 |  | 143,909,233 |  |  |  |
Beginning balance at Dec. 31, 2015 | 3,122,950 |  | 1,701,459 | 1,872,594 | (436,162) | (14,941)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 320,943 |  |  | 320,943 |  |
Other comprehensive loss | 7,767 |  |  |  |  | 7,767
Stock compensation costs | 13,973 |  | 13,973 |  |  |
Tax benefit from stock compensation plans, net | 1,019 |  | 1,019 |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  | 224,071 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements | (1,182) |  | 1,962 |  | (3,144) |
Common stock dividends | (87,416) |  |  | (87,416) |  |
Ending balance (in shares) at Sep. 30, 2016 |  | 144,133,304 |  |  |  |
Ending balance at Sep. 30, 2016 | 3,378,054 |  | 1,718,413 | 2,106,121 | (439,306) | (7,174)
Beginning balance at Jun. 30, 2016 |  |  |  |  |  | (1,712)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 110,143 |  |  |  |  |
Other comprehensive loss | (5,462) |  |  |  |  | (5,462)
Tax benefit from stock compensation plans, net | 14 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2016 |  | 144,133,304 |  |  |  |
Ending balance at Sep. 30, 2016 | $ 3,378,054 |  | $ 1,718,413 | $ 2,106,121 | $ (439,306) | $ (7,174)

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