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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
--- | --- | --- | --- | --- | --- | ---
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 | 384,677 |  |  | 384,677 |  |
Other comprehensive income (loss) | (19,178) |  |  |  |  | (19,178)
Stock compensation costs | 16,502 |  | 16,502 |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  | 327,004 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements | 1,062 |  | 7,026 |  | (5,964) |
Cash dividends on common stock | (116,224) |  |  | (116,224) |  |
BALANCE (in shares) at Dec. 31, 2015 |  | 143,909,233 |  |  |  |
Ending 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 | 431,677 |  |  | 431,677 |  |
Other comprehensive income (loss) | (33,205) |  |  |  |  | (33,205)
Stock compensation costs | 22,102 |  | 22,102 |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  | 258,218 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements | 812 |  | 4,037 |  | (3,225) |
Cash dividends on common stock | (116,595) |  |  | (116,595) |  |
BALANCE (in shares) at Dec. 31, 2016 |  | 144,167,451 |  |  |  |
Ending balance at Dec. 31, 2016 | 3,427,741 |  | 1,727,598 | 2,187,676 | (439,387) | (48,146)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 505,624 |  |  | 505,624 |  |
Other comprehensive income (loss) | 10,627 |  |  |  |  | 10,627
Stock compensation costs | 24,657 |  | 24,657 |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares) |  | 375,609 |  |  |  |
Net activity of common stock pursuant to various stock compensation plans and agreements | (9,700) |  | 3,240 |  | (12,940) |
Cash dividends on common stock | (116,998) |  |  | (116,998) |  |
BALANCE (in shares) at Dec. 31, 2017 |  | 144,543,060 |  |  |  |
Ending balance at Dec. 31, 2017 | $ 3,841,951 |  | $ 1,755,495 | $ 2,576,302 | $ (452,327) | $ (37,519)

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