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Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2016 | Feb. 26, 2016 | Feb. 22, 2016 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | 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 | $ 995,279 | $ 0 |
Treasury stock, number of shares authorized to be repurchased |  |  |  |  | 40,000,000.0 |  |  |
Number of shares repurchased |  |  |  |  | 5,000,000.0 | 0 | 0 |
Cost of shares repurchased |  |  |  |  | $ 123,700 |  |  |
Cumulative number of shares repurchased under a share repurchase program |  |  |  |  | 34,900,000 |  |  |
Treasury stock, cumulative shares retired |  |  |  |  | 20,000,000 |  |  |
Cumulative cost of shares repurchased under a share repurchase program |  |  |  |  | $ 512,100 |  |  |
Treasury stock reissued |  |  |  |  | 0 |  |  |
Shares held as treasury stock (in shares) |  |  |  |  | 14,935,926 | 9,892,680 |  |
2014 Incentive Plan |  |  |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  | 18,000,000
Number of shares available for issuance |  |  |  |  | 14,800,000 |  |  |
2014 Incentive Plan | Stock options | Maximum |  |  |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  | 10,000,000
Subsequent Event |  |  |  |  |  |  |  |
Incentive Plans |  |  |  |  |  |  |  |
Incremental shares approved for repurchase (in shares) |  |  |  | 25,000,000 |  |  |  |
Treasury stock, number of shares authorized to be repurchased |  |  |  | 30,100,000 |  |  |  |

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