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Stockholders' Equity (Schedule of Stock Repurchased and Retired) (Details) - Class A common stock - $ / shares | 6 Months Ended | 29 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |
Shares repurchased pursuant to repurchase authorizations (in shares) | 640,586 | 1,683,311
Average purchase price (in dollars per share) | $ 99.89 | $ 89.96

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