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Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 02, 2016 | Feb. 26, 2016 | Feb. 22, 2016 | Oct. 31, 2018 | Jul. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 30, 2018 | May 01, 2014
Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 6,600,000.0 |  | 44,000,000 |  |  |  |  |  |  |  |  |  |
Share price (in usd per share) |  |  |  | $ 19.675 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net |  | $ 129,900 | $ 865,700 |  |  |  |  |  |  | $ 0 | $ 0 | $ 995,279 |  |
Incremental shares approved for repurchase (in shares) |  |  |  |  |  | 20,000,000 | 25,000,000 |  |  |  |  |  |  |
Treasury stock, number of shares authorized to be repurchased |  |  |  |  |  |  |  |  |  | 11,600,000 |  |  |  |
Number of shares repurchased |  |  |  |  |  |  |  |  |  | 38,500,000.0 | 5,000,000.0 | 0 |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  |  | $ 904,100 | $ 123,700 |  |  |
Cumulative number of shares repurchased under a share repurchase program |  |  |  |  |  |  |  |  |  | 73,400,000 |  |  |  |
Treasury stock, cumulative shares retired |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |
Cumulative cost of shares repurchased under a share repurchase program |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |
Treasury stock reissued |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Shares held as treasury stock (in shares) | 14,935,926 |  |  |  |  |  |  |  |  | 53,409,705 | 14,935,926 |  | 1,379,268 |
Cash dividends, per share (in dollars per share) | $ 0.05 |  |  |  | $ 0.07 |  |  | $ 0.06 | $ 0.06 | $ 0.25 | $ 0.17 | $ 0.08 |  |
2014 Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000
Number of shares available for issuance |  |  |  |  |  |  |  |  |  | 13,700,000 |  |  |  |
2014 Incentive Plan | Stock options | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000

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