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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comp. Income (Loss), net
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 3,707,952,000 | $ 77,740,000 | $ 3,115,304,000 | $ 519,144,000 | $ (4,236,000)
Balance (in shares) at Dec. 31, 2017 |  | 77,740,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 1,616,000 | $ 87,000 | 1,529,000 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 87,000 |  |  |
Common dividends paid | (10,974,000) |  |  | (10,974,000) |
Issuance of restricted common shares, net of forfeitures | 0 | $ 106,000 | (106,000) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 106,000 |  |  |
Restricted shares withheld for taxes and related tax benefit | (5,265,000) | $ (80,000) | (5,185,000) |  |
Stock-based compensation expense | 4,448,000 |  | 4,448,000 |  |
Restricted shares withheld for taxes (in shares) |  | (80,000) |  |  |
Net income | 83,510,000 |  |  | 83,510,000 |
Other comprehensive income (loss) | (31,984,000) |  |  |  | (31,984,000)
Balance at Mar. 31, 2018 | 3,749,303,000 | $ 77,853,000 | 3,115,990,000 | 591,680,000 | (36,220,000)
Balance (in shares) at Mar. 31, 2018 |  | 77,853,000 |  |  |
Balance at Dec. 31, 2018 | 3,965,940,000 | $ 77,484,000 | 3,107,431,000 | 833,130,000 | (52,105,000)
Balance (in shares) at Dec. 31, 2018 |  | 77,484,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 130,000 | $ 5,000 | 125,000 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 5,000 |  |  |
Common dividends paid | (12,545,000) |  |  | (12,545,000) |
Repurchase of common stock (in shares) |  | (543,000) |  |  |
Repurchase of common stock | (30,049,000) | $ (543,000) | (29,506,000) |  |
Issuance of restricted common shares, net of forfeitures | 0 | $ 180,000 | (180,000) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 180,000 |  |  |
Restricted shares withheld for taxes and related tax benefit | (3,487,000) | $ (62,000) | (3,425,000) |  |
Stock-based compensation expense | 4,913,000 |  | 4,913,000 |  |
Restricted shares withheld for taxes (in shares) |  | (62,000) |  |  |
Net income | 93,960,000 |  |  | 93,960,000 |
Other comprehensive income (loss) | 37,077,000 |  |  |  | 37,077,000
Balance at Mar. 31, 2019 | $ 4,055,939,000 | $ 77,064,000 | $ 3,079,358,000 | $ 914,545,000 | $ (15,028,000)
Balance (in shares) at Mar. 31, 2019 |  | 77,064,000 |  |  |

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