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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 2,523,905 | $ 47,555 | $ (430,576) | $ 1,742,419 | $ 2,077 | $ 1,162,430
Balance (in shares) at Dec. 31, 2017 |  | 475,547 | 14,936 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 117,231 |  |  |  |  | 117,231
Stock amortization and vesting | 302 | $ 53 |  | 249 |  |
Stock amortization and vesting (in shares) |  | 534 |  |  |  |
Purchase of treasury stock | (207,135) |  | $ (207,135) |  |  |
Purchase of treasury stock (in shares) |  |  | 8,328 |  |  |
Cash dividends | (27,647) |  |  |  |  | (27,647)
Other comprehensive income (loss) | 306 |  |  |  | 306 |
Balance at end of period at Mar. 31, 2018 | 2,406,516 | $ 47,608 | $ (637,711) | 1,742,668 | 2,383 | 1,251,568
Balance (in shares) at Mar. 31, 2018 |  | 476,081 | 23,264 |  |  |
Balance at beginning of period at Dec. 31, 2017 | 2,523,905 | $ 47,555 | $ (430,576) | 1,742,419 | 2,077 | 1,162,430
Balance (in shares) at Dec. 31, 2017 |  | 475,547 | 14,936 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 281,998 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 2,094,147 | $ 47,609 | $ (1,074,708) | 1,756,337 | 2,112 | 1,362,797
Balance (in shares) at Sep. 30, 2018 |  | 476,089 | 42,080 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative impact from accounting change | (446) |  |  |  |  | (446)
Balance at beginning of period at Mar. 31, 2018 | 2,406,516 | $ 47,608 | $ (637,711) | 1,742,668 | 2,383 | 1,251,568
Balance (in shares) at Mar. 31, 2018 |  | 476,081 | 23,264 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 42,431 |  |  |  |  | 42,431
Exercise of stock appreciation rights | 1 | $ 1 |  |  |  |
Exercise of stock appreciation rights (in shares) |  | 3 |  |  |  |
Stock amortization and vesting | 6,769 | $ 0 |  | 6,769 |  |
Stock amortization and vesting (in shares) |  | 2 |  |  |  |
Purchase of treasury stock | (274,337) |  | $ (274,337) |  |  |
Purchase of treasury stock (in shares) |  |  | 11,646 |  |  |
Cash dividends | (27,071) |  |  |  |  | (27,071)
Other comprehensive income (loss) | (135) |  |  |  | (135) |
Balance at end of period at Jun. 30, 2018 | 2,154,174 | $ 47,609 | $ (912,048) | 1,749,437 | 2,248 | 1,266,928
Balance (in shares) at Jun. 30, 2018 |  | 476,086 | 34,910 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 122,337 |  |  |  |  | 122,337
Exercise of stock appreciation rights | 0 |  |  |  |  |
Exercise of stock appreciation rights (in shares) |  | 2 |  |  |  |
Stock amortization and vesting | 6,900 |  |  | 6,900 |  |
Stock amortization and vesting (in shares) |  | 1 |  |  |  |
Purchase of treasury stock | (162,660) |  | $ (162,660) |  |  |
Purchase of treasury stock (in shares) |  |  | 7,170 |  |  |
Cash dividends | (26,468) |  |  |  |  | (26,468)
Other comprehensive income (loss) | (136) |  |  |  | (136) |
Balance at end of period at Sep. 30, 2018 | 2,094,147 | $ 47,609 | $ (1,074,708) | 1,756,337 | 2,112 | 1,362,797
Balance (in shares) at Sep. 30, 2018 |  | 476,089 | 42,080 |  |  |
Balance at beginning of period at Dec. 31, 2018 | 2,088,159 | $ 47,610 | $ (1,334,688) | 1,763,142 | 4,437 | 1,607,658
Balance (in shares) at Dec. 31, 2018 |  | 476,095 | 53,410 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 262,763 |  |  |  |  | 262,763
Stock amortization and vesting | (213) | $ 68 |  | (281) |  |
Stock amortization and vesting (in shares) |  | 682 |  |  |  |
Purchase of treasury stock | (28) |  | $ (28) |  |  |
Cash dividends | (29,605) |  |  |  |  | (29,605)
Other comprehensive income (loss) | (137) |  |  |  | (137) |
Balance at end of period at Mar. 31, 2019 | 2,320,939 | $ 47,678 | $ (1,334,716) | 1,762,861 | 4,300 | 1,840,816
Balance (in shares) at Mar. 31, 2019 |  | 476,777 | 53,410 |  |  |
Balance at beginning of period at Dec. 31, 2018 | 2,088,159 | $ 47,610 | $ (1,334,688) | 1,763,142 | 4,437 | 1,607,658
Balance (in shares) at Dec. 31, 2018 |  | 476,095 | 53,410 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 534,130 |  |  |  |  |
Purchase of treasury stock | $ (316,100) |  |  |  |  |
Purchase of treasury stock (in shares) | 15,500 |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | $ 2,213,576 | $ 47,688 | $ (1,650,784) | 1,775,579 | 4,027 | 2,037,066
Balance (in shares) at Sep. 30, 2019 |  | 476,882 | 68,957 |  |  |
Balance at beginning of period at Mar. 31, 2019 | 2,320,939 | $ 47,678 | $ (1,334,716) | 1,762,861 | 4,300 | 1,840,816
Balance (in shares) at Mar. 31, 2019 |  | 476,777 | 53,410 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 181,009 |  |  |  |  | 181,009
Stock amortization and vesting | 6,344 | $ 10 |  | 6,334 |  |
Stock amortization and vesting (in shares) |  | 102 |  |  |  |
Purchase of treasury stock | (125,260) |  | $ (125,260) |  |  |
Purchase of treasury stock (in shares) |  |  | 5,081 |  |  |
Cash dividends | (38,092) |  |  |  |  | (38,092)
Other comprehensive income (loss) | (136) |  |  |  | (136) |
Balance at end of period at Jun. 30, 2019 | 2,344,804 | $ 47,688 | $ (1,459,976) | 1,769,195 | 4,164 | 1,983,733
Balance (in shares) at Jun. 30, 2019 |  | 476,879 | 58,491 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 90,358 |  |  |  |  | 90,358
Stock amortization and vesting | 6,384 | $ 3 |  | 6,384 |  |
Purchase of treasury stock | (190,808) |  | $ (190,808) |  |  |
Purchase of treasury stock (in shares) |  |  | 10,466 |  |  |
Cash dividends | (37,025) |  |  |  |  | (37,025)
Other comprehensive income (loss) | (137) |  |  |  | (137) |
Balance at end of period at Sep. 30, 2019 | $ 2,213,576 | $ 47,688 | $ (1,650,784) | $ 1,775,579 | $ 4,027 | $ 2,037,066
Balance (in shares) at Sep. 30, 2019 |  | 476,882 | 68,957 |  |  |

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