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v3.19.3.a.u2

Common Stock (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 99 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Sep. 26, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common stock, outstanding (in shares) | 56,219,831 | 56,219,831 | 55,983,763 |  | 56,219,831 |
Dividend paid (in dollars per share) | $ 0.08 |  |  |  |  |
Stock repurchased (in US dollars) |  |  | $ 216,244,000 | $ 90,821,000 |  |
Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 0 |  |  | 15,900,000 |
Stock repurchased (in US dollars) |  |  |  | $ 10,000 | $ 791,500,000 |
Remaining authorized repurchase amount (in US dollars) | $ 158,500,000 | $ 158,500,000 |  |  | 158,500,000 |
Common Stock | RepurchaseProgramSept262011 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase, authorized amount (in US dollars) |  |  |  |  |  | $ 100,000,000.0
Common Stock | RepurchaseProgramSep2011toDec2019 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase, authorized amount (in US dollars) | $ 950,000,000.0 | $ 950,000,000.0 |  |  | $ 950,000,000.0 |

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