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Consolidated Statements of Stockholders' Equity - USD ($) | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated other comprehensive Income (loss) | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Adoption of Accounting Standards Update No. 2018-02 |  |  | $ 20,068,000 | $ (20,068,000) |  |
Balance, beginning at Dec. 31, 2017 | $ 1,396,000 | $ 2,488,643,000 | 139,177,000 | (96,383,000) | $ (282,000) | $ 2,532,551,000
Balance (in shares) at Dec. 31, 2017 | 139,588,782 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 137,011,000 |  |  | 137,011,000
Cash dividends declared |  |  | (66,296,000) |  |  | (66,296,000)
Equity-based awards |  | 3,671,000 | (345,000) |  |  | 3,326,000
Equity-based awards (in shares) | 9,006 |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  | (65,959,000) |  | (65,959,000)
Common stock issued under Employee Stock Purchase Plan |  | 342,000 |  |  |  | 342,000
Common stock issued under Employee Stock Purchase Plan (in shares) | 12,341 |  |  |  |  |
Common stock repurchased |  |  |  |  | (81,800,000) | (81,800,000)
Common stock repurchased (in shares) | (2,968,069) |  |  |  |  |
Balance, ending at Jun. 30, 2018 | $ 1,396,000 | 2,492,656,000 | 229,615,000 | (182,410,000) | (82,082,000) | 2,459,175,000
Balance (in shares) at Jun. 30, 2018 | 136,642,060 |  |  |  |  |
Balance, beginning at Mar. 31, 2018 | $ 1,396,000 | 2,490,910,000 | 193,522,000 | (164,684,000) | (282,000) | 2,520,862,000
Balance (in shares) at Mar. 31, 2018 | 139,601,123 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 69,053,000 |  |  | 69,053,000
Cash dividends declared |  |  | (32,792,000) |  |  | (32,792,000)
Equity-based awards |  | 1,746,000 | (168,000) |  |  | 1,578,000
Equity-based awards (in shares) | 9,006 |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  | (17,726,000) |  | (17,726,000)
Common stock repurchased |  |  |  |  | (81,800,000) | (81,800,000)
Common stock repurchased (in shares) | (2,968,069) |  |  |  |  |
Balance, ending at Jun. 30, 2018 | $ 1,396,000 | 2,492,656,000 | 229,615,000 | (182,410,000) | (82,082,000) | 2,459,175,000
Balance (in shares) at Jun. 30, 2018 | 136,642,060 |  |  |  |  |
Balance, beginning at Dec. 31, 2018 | $ 1,397,000 | 2,495,853,000 | 291,919,000 | (132,195,000) | (132,135,000) | $ 2,524,839,000
Balance (in shares) at Dec. 31, 2018 | 134,874,302 |  |  |  |  | 134,874,302
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 142,357,000 |  |  | $ 142,357,000
Cash dividends declared |  |  | (69,984,000) |  |  | (69,984,000)
Equity-based awards | $ 2,000 | 4,093,000 | (544,000) |  | (1,533,000) | 2,018,000
Equity-based awards (in shares) | 143,756 |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  | 100,211,000 |  | 100,211,000
Common stock repurchased |  |  |  |  | (40,000,000) | (40,000,000)
Common stock repurchased (in shares) | (1,509,846) |  |  |  |  |
Balance, ending at Jun. 30, 2019 | $ 1,399,000 | 2,499,946,000 | 363,748,000 | (31,984,000) | (173,668,000) | $ 2,659,441,000
Balance (in shares) at Jun. 30, 2019 | 133,508,212 |  |  |  |  | 133,508,212
Balance, beginning at Mar. 31, 2019 | $ 1,399,000 | 2,497,770,000 | 326,451,000 | (78,754,000) | (133,664,000) | $ 2,613,202,000
Balance (in shares) at Mar. 31, 2019 | 135,012,015 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 72,433,000 |  |  | 72,433,000
Cash dividends declared |  |  | (34,916,000) |  |  | (34,916,000)
Equity-based awards |  | 2,176,000 | (220,000) |  | (4,000) | 1,952,000
Equity-based awards (in shares) | 6,043 |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  | 46,770,000 |  | 46,770,000
Common stock repurchased |  |  |  |  | (40,000,000) | (40,000,000)
Common stock repurchased (in shares) | (1,509,846) |  |  |  |  |
Balance, ending at Jun. 30, 2019 | $ 1,399,000 | $ 2,499,946,000 | $ 363,748,000 | $ (31,984,000) | $ (173,668,000) | $ 2,659,441,000
Balance (in shares) at Jun. 30, 2019 | 133,508,212 |  |  |  |  | 133,508,212

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