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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Series A Preferred Stock | Series B Preferred Stock | Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Retained Earnings | Retained Earnings Series A Preferred Stock | Retained Earnings Series B Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2016 |  |  |  | 7,300,000 | 428,903,559 | (7,728,920) |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2016 |  |  |  |  | 436,632,479 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2016 | $ 2,347,058 |  |  | $ 565,000 | $ 87,327 | $ (67,484) | $ 1,175,564 | $ (8,671) | $ 595,322 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 94,943 |  |  |  |  |  |  |  | 94,943 |  |
Other comprehensive income (loss), net of tax | 1,980 |  |  |  |  |  |  | 1,980 |  |  |
Total comprehensive income | 96,923 |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  | $ (2,875) | $ (2,700) |  |  |  |  |  |  | $ (2,875) | $ (2,700)
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  |  | 96 |  | (96) |  |
Issuance of common shares (in shares) | 3,738,717 |  |  |  | 3,738,717 |  |  |  |  |  |
Issuance of common shares | $ 6,535 |  |  |  | $ 748 |  | 5,787 |  |  |  |
Tax benefit related to employee stock-based compensation | 0 |  |  |  |  |  | 0 |  |  |  |
Stock-based compensation expense | $ 9,425 |  |  |  |  |  | 9,425 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) | (1,603,487) |  |  |  | (1,603,487) | (1,603,487) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (19,175) |  |  |  |  | $ (19,175) |  |  |  |  |
Ending Balance (in shares) at Mar. 31, 2017 |  |  |  | 7,300,000 | 431,038,789 | (9,332,407) |  |  |  |  |
Ending Balance, shares issued (in shares) at Mar. 31, 2017 |  |  |  |  | 440,371,196 |  |  |  |  |  |
Ending Balance at Mar. 31, 2017 | 2,435,356 |  |  | $ 565,000 | $ 88,075 | $ (86,659) | 1,191,466 | (6,691) | 684,165 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of the adoption of the new stock compensation standard amendment | Accounting Standards Update 2016-09, New Stock Compensation Standard Amendment | 165 |  |  |  |  |  | 594 |  | (429) |  |
Beginning Balance (in shares) at Dec. 31, 2017 |  |  |  | 4,000,000 | 432,376,250 | (11,087,337) |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2017 |  |  |  |  | 443,463,587 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | 2,474,256 |  |  | $ 400,000 | $ 88,693 | $ (107,644) | 1,222,277 | 2,748 | 868,182 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 126,254 |  |  |  |  |  |  |  | 126,254 |  |
Other comprehensive income (loss), net of tax | 12,261 |  |  |  |  |  |  | 12,261 |  |  |
Total comprehensive income | 138,515 |  |  |  |  |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2018-02 | Accounting Standards Update 2018-02 | $ 0 |  |  |  |  |  |  | 592 | (592) |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  | $ (3,397) |  |  |  |  |  |  |  | $ (3,397)
Issuance of common shares (in shares) | 5,559,991 |  |  |  | 5,559,991 |  |  |  |  |  |
Issuance of common shares | $ 16,699 |  |  |  | $ 1,112 |  | 15,587 |  |  |  |
Stock-based compensation expense | $ 14,745 |  |  |  |  |  | 14,745 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) | (2,740,018) |  |  |  | (2,740,018) | (2,740,018) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (30,985) |  |  |  |  | $ (30,985) |  |  |  |  |
Ending Balance (in shares) at Mar. 31, 2018 |  |  |  | 4,000,000 | 435,196,223 | (13,827,355) |  |  |  |  |
Ending Balance, shares issued (in shares) at Mar. 31, 2018 |  |  |  |  | 449,023,578 |  |  |  |  |  |
Ending Balance at Mar. 31, 2018 | $ 2,609,833 |  |  | $ 400,000 | $ 89,805 | $ (138,629) | $ 1,252,609 | $ 15,601 | $ 990,447 |  |

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