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Stockholders' Equity ASR Activity (Details) - Common Class A [Member] $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($) $ / shares shares
Equity, Class of Treasury Stock [Line Items] |
Treasury stock, value | $ 150,000
March 2017 ASR [Member] |
Equity, Class of Treasury Stock [Line Items] |
Treasury stock, shares acquired | shares | 1,326
Treasury stock, value | $ 50,000
April 2016 ASR [Member] |
Equity, Class of Treasury Stock [Line Items] |
Treasury stock, shares acquired | shares | 2,219
Treasury stock acquired, average cost per share (in USD per share) | $ / shares | $ 22.54
Treasury stock, value | $ 50,000
September 2015 ASR [Member] |
Equity, Class of Treasury Stock [Line Items] |
Treasury stock, shares acquired | shares | 2,342
Treasury stock acquired, average cost per share (in USD per share) | $ / shares | $ 17.08
Treasury stock, value | $ 40,000

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