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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Paid-in capital | Treasury stock | Accumulated other comprehensive income (loss) | Retained earnings
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2017 |  | $ 370,567 | $ 1,850,582 | $ 0 | $ (43,801) | $ 977,178
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 781 | (8,854) |  |  |
Reissuance of treasury stock, net under share-based compensation plans |  |  | 0 | 0 |  |
Equity compensation |  |  | 10,523 |  |  |
Repurchase of common stock |  |  |  | (100,059) |  |
Other comprehensive income (loss), net of tax | $ (73,493) |  |  |  | (73,493) |
Net income | 330,451 |  |  |  |  | 330,451
Balance, end of period at Jun. 30, 2018 | 3,313,875 | 371,348 | 1,852,251 | (100,059) | (117,294) | 1,307,629
Balance, beginning of period at Mar. 31, 2018 |  | 371,348 | 1,847,000 | 0 | (107,760) | 1,120,815
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 0 | 0 |  |  |
Reissuance of treasury stock, net under share-based compensation plans |  |  | 0 | 0 |  |
Equity compensation |  |  | 5,251 |  |  |
Repurchase of common stock |  |  |  | (100,059) |  |
Other comprehensive income (loss), net of tax | (9,534) |  |  |  | (9,534) |
Net income | 186,814 |  |  |  |  | 186,814
Balance, end of period at Jun. 30, 2018 | 3,313,875 | 371,348 | 1,852,251 | (100,059) | (117,294) | 1,307,629
Balance, beginning of period at Dec. 31, 2018 | 3,581,891 | 371,353 | 1,862,536 | (175,059) | (124,214) | 1,647,275
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 0 | 0 |  |  |
Reissuance of treasury stock, net under share-based compensation plans |  |  | (11,582) | 5,930 |  |
Equity compensation |  |  | 9,624 |  |  |
Repurchase of common stock |  |  |  | (24,941) |  |
Other comprehensive income (loss), net of tax | 155,024 |  |  |  | 155,024 |
Net income | 319,719 |  |  |  |  | 319,719
Balance, end of period at Jun. 30, 2019 | 4,035,665 | 371,353 | 1,860,578 | (194,070) | 30,810 | 1,966,994
Balance, beginning of period at Mar. 31, 2019 |  | 371,353 | 1,856,236 | (169,129) | (41,493) | 1,799,216
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 0 | 0 |  |  |
Reissuance of treasury stock, net under share-based compensation plans |  |  | 0 | 0 |  |
Equity compensation |  |  | 4,342 |  |  |
Repurchase of common stock |  |  |  | (24,941) |  |
Other comprehensive income (loss), net of tax | 72,303 |  |  |  | 72,303 |
Net income | 167,778 |  |  |  |  | 167,778
Balance, end of period at Jun. 30, 2019 | $ 4,035,665 | $ 371,353 | $ 1,860,578 | $ (194,070) | $ 30,810 | $ 1,966,994

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