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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | ---
Stockholders' equity at beginning of period at Dec. 31, 2017 | $ 2,850,157 | $ 89,331 | $ 791,446 | $ 724,599 | $ 1,244,781
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | 140,962 |  |  |  | 140,962
Other comprehensive income (loss) | (452,171) |  |  | (452,171) |
Implementation of accounting standard related to the reclassification of certain tax effects |  |  |  | 127,554 | (127,554)
Share-based compensation | 3,526 |  | 3,526 |  |
Issuance of common stock under compensation plans | 4,516 | 653 | 3,863 |  |
Stockholders' equity at end of period at Mar. 31, 2018 | 2,546,990 | 89,984 | 798,835 | 399,982 | 1,258,189
Stockholders' equity at beginning of period at Dec. 31, 2018 | 2,399,101 | 90,369 | 811,186 | (52,432) | 1,549,978
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | (30,010) |  |  |  | (30,010)
Other comprehensive income (loss) | 566,129 |  |  | 566,129 |
Share-based compensation | 4,205 |  | 4,205 |  |
Issuance of common stock under compensation plans | 112 | 415 | (303) |  |
Stockholders' equity at end of period at Mar. 31, 2019 | $ 2,939,537 | $ 90,784 | $ 815,088 | $ 513,697 | $ 1,519,968

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