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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
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of accounting principle | $ 165 |  |  |  |  |  |  | $ 429 |  | $ (264) |  |
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 | 241,931 |  |  |  |  |  |  |  |  | 241,931 |  |
Other comprehensive income, net of tax | 4,254 |  |  |  |  |  |  |  | 4,254 |  |  |
Total comprehensive income | $ 246,185 |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  | $ (3,961) | $ (8,616) |  |  |  |  |  |  |  | $ (3,961) | $ (8,616)
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 |  |  |  |  |  |  |  | 96 |  | (96) |  |
Issuance of common shares (in shares) | 5,652,886 |  |  |  |  | 5,652,886 |  |  |  |  |  |
Issuance of common shares | $ 16,467 |  |  |  |  | $ 1,131 |  | 15,336 |  |  |  |
Stock-based compensation expense | $ 21,773 |  |  |  |  |  |  | 21,773 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) | (2,666,781) |  |  |  |  | (2,666,781) | (2,666,781) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (32,231) |  |  |  |  |  | $ (32,231) |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2017 |  |  |  | 4,000,000 |  | 431,889,664 | 10,395,701 |  |  |  |  |
Ending Balance, shares issued (in shares) at Sep. 30, 2017 |  |  |  |  |  | 442,285,365 |  |  |  |  |  |
Ending Balance at Sep. 30, 2017 | 2,421,840 |  |  | $ 400,000 |  | $ 88,458 | $ (99,715) | 1,213,198 | (4,417) | 824,316 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of accounting principle | Accounting Standards Update 2017-12 | 1,052 |  |  |  |  |  |  |  | 270 | 782 |  |
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 | 339,964 |  |  |  |  |  |  |  |  | 339,964 |  |
Other comprehensive income, net of tax | 23,402 |  |  |  |  |  |  |  | 23,402 |  |  |
Total comprehensive income | $ 363,366 |  |  |  |  |  |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2018-02 |  |  |  |  |  |  |  |  | 592 | (592) |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  | $ (11,441) |  |  |  |  |  |  |  |  | $ (11,441)
Issuance of common shares (in shares) | 6,341,950 |  |  |  |  | 6,341,950 |  |  |  |  |  |
Issuance of common shares | $ 21,927 |  |  |  |  | $ 1,269 |  | 20,658 |  |  |  |
Stock-based compensation expense | $ 25,828 |  |  |  |  |  |  | 25,828 |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) | (3,056,746) |  |  |  |  | (3,056,746) | (3,056,746) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (34,653) |  |  |  |  |  | $ (34,653) |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2018 |  |  |  | 4,000,000 |  | 435,661,454 | 14,144,083 |  |  |  |  |
Ending Balance, shares issued (in shares) at Sep. 30, 2018 |  |  |  |  |  | 449,805,537 |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 | $ 2,840,335 |  |  | $ 400,000 |  | $ 89,962 | $ (142,297) | $ 1,268,763 | $ 27,012 | $ 1,196,895 |  |

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