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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Series A Preferred Stock | Series B Preferred Stock | Preferred Stock | Preferred Stock Series A Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Retained Earnings Series A Preferred Stock | Retained Earnings Series B Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2015 |  |  |  | 7,300,000 |  | 426,303,244 | (4,374,190) |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2015 |  |  |  |  |  | 430,677,434 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 | $ 2,096,323 |  |  | $ 565,000 |  | $ 86,136 | $ (41,223) | $ 1,135,860 | $ (16,059) | $ 366,609 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 123,120 |  |  |  |  |  |  |  |  | 123,120 |  |
Other comprehensive income (loss), net of tax | (17,794) |  |  |  |  |  |  |  | (17,794) |  |  |
Total comprehensive income | 105,326 |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends, preferred stock |  | $ (5,750) | $ (4,632) |  |  |  |  |  |  |  | $ (5,750) | $ (4,632)
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  |  |  | 400 |  | (400) |  |
Issuance of common shares (in shares) | 3,166,474 |  |  |  |  | 3,166,474 |  |  |  |  |  |
Issuance of common shares | $ 3,857 |  |  |  |  | $ 633 |  | 3,224 |  |  |  |
Tax benefit related to employee stock-based compensation | (2,249) |  |  |  |  |  |  | (2,249) |  |  |  |
Stock-based compensation expense | 12,548 |  |  |  |  |  |  | 12,548 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  | (1,391,927) | (1,391,927) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | (8,512) |  |  |  |  |  | $ (8,512) |  |  |  |  |
Ending Balance (in shares) at Jun. 30, 2016 |  |  |  | 7,300,000 |  | 428,077,791 | (5,766,117) |  |  |  |  |
Ending Balance, shares issued (in shares) at Jun. 30, 2016 |  |  |  |  |  | 433,843,908 |  |  |  |  |  |
Ending Balance at Jun. 30, 2016 | 2,196,911 |  |  | $ 565,000 |  | $ 86,769 | $ (49,735) | 1,149,783 | (33,853) | 478,947 |  |
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 | 165,560 |  |  |  |  |  |  |  |  | 165,560 |  |
Other comprehensive income (loss), net of tax | 819 |  |  |  |  |  |  |  | 819 |  |  |
Total comprehensive income | 166,379 |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of the new stock compensation standard | 165 |  |  |  |  |  |  | 429 |  | (264) |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends, preferred stock |  | (3,961) | $ (5,588) |  |  |  |  |  |  |  | $ (3,961) | $ (5,588)
Redemption of Series A Preferred Stock (in shares) |  |  |  |  | (3,300,000) |  |  |  |  |  |  |
Redemption of Series A Preferred Stock |  | $ (165,000) |  |  | $ (165,000) |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  |  |  | 96 |  | (96) |  |
Issuance of common shares (in shares) | 5,229,774 |  |  |  |  | 5,229,774 |  |  |  |  |  |
Issuance of common shares | $ 14,494 |  |  |  |  | $ 1,046 |  | 13,448 |  |  |  |
Stock-based compensation expense | 15,500 |  |  |  |  |  |  | 15,500 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  | (2,584,964) | (2,584,964) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | (31,337) |  |  |  |  |  | $ (31,337) |  |  |  |  |
Ending Balance (in shares) at Jun. 30, 2017 |  |  |  | 4,000,000 |  | 431,548,369 | (10,313,884) |  |  |  |  |
Ending Balance, shares issued (in shares) at Jun. 30, 2017 |  |  |  |  |  | 441,862,253 |  |  |  |  |  |
Ending Balance at Jun. 30, 2017 | $ 2,337,710 |  |  | $ 400,000 |  | $ 88,373 | $ (98,821) | $ 1,205,037 | $ (7,852) | $ 750,973 |  |

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