Stockholders' Equity ASR Activity (Details) - Common Class A [Member] $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended |
---|---|
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 |