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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | [2]
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | $ 3,841,951 |  | $ 4,591,930 | $ 3,978,755 | $ 4,423,974 | $ 3,841,951 |
Cumulative effect of a change in accounting principle |  | (160) | [1] |  |  |  |  | $ 14,668
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [3] |  |  |  |  |  | 0 |
Other comprehensive income (loss) |  |  |  | 23,011 | (15,663) | 48,202 | (27,677) |
Ending balance |  |  |  | 4,734,593 | 4,114,284 | 4,734,593 | 4,114,284 |
Available- for-Sale Investment Securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (30,898) |  | (23,810) | (55,981) | (45,821) | (30,898) |
Net unrealized gains (losses) arising during the period |  |  |  | 30,046 | (8,693) | 53,157 | (26,004) |
Amounts reclassified from AOCI |  |  |  | (1,019) | (148) | (2,119) | (1,649) |
Other comprehensive income (loss) |  |  |  | 29,027 | (8,841) | 51,038 | (27,653) |
Ending balance |  |  |  | 5,217 | (64,822) | 5,217 | (64,822) |
Available- for-Sale Investment Securities | ASU 2016-01 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  | 385 |  |  |  |  |  |
Available- for-Sale Investment Securities | ASU 2018-02 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | (6,656) |  |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (6,621) |  | (9,173) | 177 | (12,353) | (6,621) |
Net unrealized gains (losses) arising during the period |  |  |  | (6,016) | (6,822) | (2,836) | (24) |
Amounts reclassified from AOCI |  |  |  | 0 | 0 | 0 | 0 |
Other comprehensive income (loss) |  |  |  | (6,016) | (6,822) | (2,836) | (24) |
Ending balance |  |  |  | (15,189) | (6,645) | (15,189) | (6,645) |
Foreign Currency Translation Adjustments | ASU 2016-01 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  | 0 |  |  |  |  |  |
Foreign Currency Translation Adjustments | ASU 2018-02 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | 0 |  |  |  |  |  |
AOCI, Net of Tax |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (37,519) |  | (32,983) | (55,804) | (58,174) | (37,519) |
Cumulative effect of a change in accounting principle | [1] | 385 |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [3] |  |  |  |  |  | (6,656) |
Net unrealized gains (losses) arising during the period |  |  |  | 24,030 | (15,515) | 50,321 | (26,028) |
Amounts reclassified from AOCI |  |  |  | (1,019) | (148) | (2,119) | (1,649) |
Other comprehensive income (loss) |  |  |  | 23,011 | (15,663) | 48,202 | (27,677) |
Ending balance |  |  |  | $ (9,972) | $ (71,467) | $ (9,972) | $ (71,467) |
AOCI, Net of Tax | ASU 2016-01 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  | 385 |  |  |  |  |  |
AOCI, Net of Tax | ASU 2018-02 |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  | (6,656) |  |  |  |  |  |
Scenario, Adjustment | Available- for-Sale Investment Securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Ending balance |  | (37,169) |  |  |  |  |  |
Scenario, Adjustment | Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Ending balance |  | (6,621) |  |  |  |  |  |
Scenario, Adjustment | AOCI, Net of Tax |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Ending balance |  | $ (43,790) |  |  |  |  |  |
[1] |
|  | Common Stock and Additional Paid-in Capital |  | Retained Earnings |  | Treasury Stock |  | AOCI, Net of Tax |  | Total Stockholders’ Equity
|  | Shares |  | Amount |  |  |  |
BALANCE, JANUARY 1, 2018 |  | 144,543,060 |  |  | $ | 1,755,495 |  |  | $ | 2,576,302 |  |  | $ | (452,327 | ) |  | $ | (37,519 | ) |  | $ | 3,841,951 |
Cumulative effect of change in accounting principle related to marketable equity securities (1) |  | — |  |  | — |  |  | (545 | ) |  | — |  |  | 385 |  |  | (160 | )
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate (2) |  | — |  |  | — |  |  | 6,656 |  |  | — |  |  | (6,656 | ) |  | — |
Net income |  | — |  |  | — |  |  | 359,381 |  |  | — |  |  | — |  |  | 359,381 |
Other comprehensive loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (27,677 | ) |  | (27,677 | )
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 361,569 |  |  | 14,543 |  |  | — |  |  | (15,161 | ) |  | — |  |  | (618 | )
Cash dividends on common stock ($0.40 per share) |  | — |  |  | — |  |  | (58,593 | ) |  | — |  |  | — |  |  | (58,593 | )
BALANCE, JUNE 30, 2018 |  | 144,904,629 |  |  | $ | 1,770,038 |  |  | $ | 2,883,201 |  |  | $ | (467,488 | ) |  | $ | (71,467 | ) |  | $ | 4,114,284 |
BALANCE, JANUARY 1, 2019 |  | 144,961,363 |  |  | $ | 1,789,977 |  |  | $ | 3,160,132 |  |  | $ | (467,961 | ) |  | $ | (58,174 | ) |  | $ | 4,423,974 |
Cumulative effect of change in accounting principle related to leases (3) |  | — |  |  | — |  |  | 14,668 |  |  | — |  |  | — |  |  | 14,668 |
Net income |  | — |  |  | — |  |  | 314,404 |  |  | — |  |  | — |  |  | 314,404 |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | 48,202 |  |  | 48,202 |
Warrants exercised |  | 180,226 |  |  | 1,711 |  |  | — |  |  | 2,732 |  |  | — |  |  | 4,443 |
Net activity of common stock pursuant to various stock compensation plans and agreements |  | 404,980 |  |  | 17,374 |  |  | — |  |  | (14,169 | ) |  | — |  |  | 3,205 |
Cash dividends on common stock ($0.505 per share) |  | — |  |  | — |  |  | (74,303 | ) |  | — |  |  | — |  |  | (74,303 | )
BALANCE, JUNE 30, 2019 |  | 145,546,569 |  |  | $ | 1,809,062 |  |  | $ | 3,414,901 |  |  | $ | (479,398 | ) |  | $ | (9,972 | ) |  | $ | 4,734,593 |
[2] | Represents the impact of the adoption of ASU 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019. Refer to Note 2 — Current Accounting Developments and Note 11 — Leases to the Consolidated Financial Statements in this Form 10-Q for additional information.
[3] | Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018.

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