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Capital Stock (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) Vote $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Oct. 31, 2015 USD ($) | Aug. 31, 2013 USD ($) | Dec. 31, 1998 USD ($)
Capital Stock [Abstract] |  |  |  |  |  |
Preferred stock, authorized (in shares) | 25,000,000 |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |
Common stock, shares authorized (in shares) | 500,000,000 | 500,000,000 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  |  |  |
Preferred stock, shares outstanding (in shares) | 0 | 0 |  |  |  |
Weighted Average Shares Outstanding [Abstract] |  |  |  |  |  |
Basic weighted-average common shares outstanding (in shares) | 52,806,000 | 55,412,000 | 57,997,000 |  |  |
Effect of Dilutive Securities [Abstract] |  |  |  |  |  |
Stock awards and options (in shares) | 1,110,000 | 683,000 | 1,060,000 |  |  |
Convertible note (in shares) | 936,000 | 2,000 | 0 |  |  |
Diluted weighted-average common shares outstanding (in shares) | 54,852,000 | 56,097,000 | 59,057,000 |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |
Repurchase of Class A common stock | $ | $ 71,731 | $ 247,208 | $ 164,094 |  |  |
Amount available for repurchases | $ | $ 128,000 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Effect of Dilutive Securities [Abstract] |  |  |  |  |  |
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares) | 400,000 | 2,000,000 | 1,800,000 |  |  |
Common Class A [Member] |  |  |  |  |  |
Capital Stock [Abstract] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 500,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |
Number of votes per share | Vote | 1 |  |  |  |  |
Number of shares of class A common stock issued after conversion of Class B common stock (in shares) | 1 |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |
Shares repurchased (in shares) | 1,200,000 | 4,500,000 | 3,800,000 |  |  |
Authorized amount | $ |  |  |  | $ 500,000 |  | $ 10,000
Increase in authorized amount | $ |  |  |  |  | $ 400,000 |
Common Class B [Member] |  |  |  |  |  |
Capital Stock [Abstract] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |
Common stock, shares outstanding (in shares) | 0 | 0 |  |  |  |
Number of votes per share | Vote | 10 |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |
Repurchase of Class A common stock | $ | $ 71,731 | $ 247,208 | $ 164,094 |  |  |

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