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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | [2]
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | $ 3,841,951 |  | $ 4,423,974 | $ 3,841,951 | $ 3,427,741 |
Cumulative effect of change in accounting principle related to marketable equity securities |  | (160) | [1] |  |  |  | $ 10,510
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [3] | 0 |  |  |  |  |
Net unrealized gains (losses) arising during the period |  |  |  | 42,534 | (12,598) | 15,284 |
Amount reclassified from AOCI |  |  |  | (2,768) | (1,786) | (4,657) |
Other comprehensive income (loss) |  |  |  | 39,766 | (14,384) | 10,627 |
Ending balance |  |  |  | 5,017,617 | 4,423,974 | 3,841,951 |
Available- for-Sale Debt Investment Securities |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (30,898) |  | (45,821) | (30,898) | (28,772) |
Net unrealized gains (losses) arising during the period |  |  |  | 46,170 | (6,866) | 2,531 |
Amount reclassified from AOCI |  |  |  | (2,768) | (1,786) | (4,657) |
Other comprehensive income (loss) |  |  |  | 43,402 | (8,652) | (2,126) |
Ending balance |  |  |  | (2,419) | (45,821) | (30,898) |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (6,621) |  | (12,353) | (6,621) | (19,374) |
Net unrealized gains (losses) arising during the period |  |  |  | (3,636) | (5,732) | 12,753 |
Amount reclassified from AOCI |  |  |  | 0 | 0 | 0 |
Other comprehensive income (loss) |  |  |  | (3,636) | (5,732) | 12,753 |
Ending balance |  |  |  | (15,989) | (12,353) | (6,621) |
Total |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (37,519) |  | (58,174) | (37,519) | (48,146) |
Cumulative effect of change in accounting principle related to marketable equity securities | [1] | 385 |  |  |  |  |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | [3] | 6,656 |  |  |  |  |
Other comprehensive income (loss) |  |  |  | 39,766 | (14,384) | 10,627 |
Ending balance |  |  |  | $ (18,408) | $ (58,174) | $ (37,519) |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of change in accounting principle related to marketable equity securities |  | 385 |  |  |  |  |
Accounting Standards Update 2016-01 | Available- for-Sale Debt Investment Securities |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of change in accounting principle related to marketable equity securities |  | 385 |  |  |  |  |
Accounting Standards Update 2016-01 | Foreign Currency Translation Adjustments |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of change in accounting principle related to marketable equity securities |  | 0 |  |  |  |  |
Accounting Standards Update 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) |  |  |  |  |
Accounting Standards Update 2018-02 | Available- for-Sale Debt Investment Securities |  |  |  |  |  |  |
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) |  |  |  |  |
Accounting Standards Update 2018-02 | Foreign Currency Translation Adjustments |  |  |  |  |  |  |
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 |  |  |  |  |
Accounting Standards Update 2018-02 | Total |  |  |  |  |  |  |
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 Debt 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 | Total |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Ending balance |  | $ (43,790) |  |  |  |  |
[1] | Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Annual Report on Form 10-K (“this Form 10-K”) for additional information.
[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 1 — Summary of Significant Accounting Policies and Note 10 — Leases to the Consolidated Financial Statements in this Form 10-K 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. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements for additional information.

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