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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comp. Income (Loss), net
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 3,707,952 | $ 77,740 | $ 3,115,304 | $ 519,144 | $ (4,236)
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 | 1,700 | $ 90 | 1,610 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 90,000 |  |  |
Common dividends paid | (32,903) |  |  | (32,903) |
Issuance of restricted common shares, net of forfeitures | 0 | $ 141 | (141) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 141,000 |  |  |
Restricted shares withheld for taxes & related tax benefit | (6,808) | $ (104) | (6,704) |  |
Restricted shares withheld for taxes (in shares) |  | (104,000) |  |  |
Stock-based compensation expense | 13,254 |  | 13,254 |  |
Net income | 264,122 |  |  | 264,122 |
Other comprehensive income (loss) | (50,276) |  |  |  | (50,276)
Balance at Sep. 30, 2018 | 3,897,041 | $ 77,867 | 3,123,323 | 750,363 | (54,512)
Balance (in shares) at Sep. 30, 2018 |  | 77,867,000 |  |  |
Balance at Jun. 30, 2018 | 3,826,677 | $ 77,855 | 3,119,461 | 667,594 | (38,233)
Balance (in shares) at Jun. 30, 2018 |  | 77,855,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 0 | $ 0 | 0 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 0 |  |  |
Common dividends paid | (10,978) |  |  | (10,978) |
Issuance of restricted common shares, net of forfeitures | 0 | $ 22 | (22) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 22,000 |  |  |
Restricted shares withheld for taxes & related tax benefit | (629) | $ (10) | (619) |  |
Restricted shares withheld for taxes (in shares) |  | (10,000) |  |  |
Stock-based compensation expense | 4,503 |  | 4,503 |  |
Net income | 93,747 |  |  | 93,747 |
Other comprehensive income (loss) | (16,279) |  |  |  | (16,279)
Balance at Sep. 30, 2018 | 3,897,041 | $ 77,867 | 3,123,323 | 750,363 | (54,512)
Balance (in shares) at Sep. 30, 2018 |  | 77,867,000 |  |  |
Balance at Dec. 31, 2018 | 3,965,940 | $ 77,484 | 3,107,431 | 833,130 | (52,105)
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 | 247 | $ 10 | 237 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 10,000 |  |  |
Common dividends paid | (37,415) |  |  | (37,415) |
Repurchase of common stock | (48,489) | $ (873) | (47,616) |  |
Repurchase of common stock (in shares) |  | (873,000) |  |  |
Issuance of restricted common shares, net of forfeitures | 0 | $ 200 | (200) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 200,000 |  |  |
Restricted shares withheld for taxes & related tax benefit | (4,793) | $ (85) | (4,708) |  |
Restricted shares withheld for taxes (in shares) |  | (85,000) |  |  |
Stock-based compensation expense | 15,091 |  | 15,091 |  |
Net income | 304,802 |  |  | 304,802 |
Other comprehensive income (loss) | 99,247 |  |  |  | 99,247
Balance at Sep. 30, 2019 | 4,294,630 | $ 76,736 | 3,070,235 | 1,100,517 | 47,142
Balance (in shares) at Sep. 30, 2019 |  | 76,736,000 |  |  |
Balance at Jun. 30, 2019 | 4,176,361 | $ 76,929 | 3,076,486 | 1,002,434 | 20,512
Balance (in shares) at Jun. 30, 2019 |  | 76,929,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 108 | $ 4 | 104 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 4,000 |  |  |
Common dividends paid | (12,438) |  |  | (12,438) |
Repurchase of common stock | (11,065) | $ (198) | (10,867) |  |
Repurchase of common stock (in shares) |  | (198,000) |  |  |
Issuance of restricted common shares, net of forfeitures | 0 | $ 10 | (10) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 10,000 |  |  |
Restricted shares withheld for taxes & related tax benefit | (505) | $ (9) | (496) |  |
Restricted shares withheld for taxes (in shares) |  | (9,000) |  |  |
Stock-based compensation expense | 5,018 |  | 5,018 |  |
Net income | 110,521 |  |  | 110,521 |
Other comprehensive income (loss) | 26,630 |  |  |  | 26,630
Balance at Sep. 30, 2019 | $ 4,294,630 | $ 76,736 | $ 3,070,235 | $ 1,100,517 | $ 47,142
Balance (in shares) at Sep. 30, 2019 |  | 76,736,000 |  |  |

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