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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity Note [Abstract] |
Class of Treasury Stock | The following table summarizes our ASR activity since inception of the stock repurchase program:
|  | Purchase Period End Date |  | Number of Shares (In thousands) |  | Average repurchase price per share |  | ASR Amount (In thousands)
March 2017 ASR |  | September 2017 |  | 1,326 |  | (1) | (1) |  | $ | 50,000 |
April 2016 ASR |  | October 2016 |  | 2,219 |  |  | $ | 22.54 |  |  | $ | 50,000 |
September 2015 ASR |  | January 2016 |  | 2,342 |  |  | $ | 17.08 |  |  | $ | 40,000 |
(1 | ) | "Number of Shares" represents shares delivered in the beginning of the purchase period and does not represent the final number of shares to be delivered under the ASR. The total number of shares ultimately delivered, and therefore the average repurchase price paid per share, will be determined at the end of the applicable purchase period based on the volume-weighted average price of our Class A common stock during that period. We expect the March 2017 ASR purchase period will end by September 2017.

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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