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Stockholders' equity
 9 Months Ended
Sep. 30, 2016
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' equity
Stockholders' equity
Stock repurchase program. On September 30, 2016, the share repurchase program authorized by the Company’s board of directors in September 2015 to repurchase up to $300 million of the Company's Class A common stock expired and has not been renewed. The repurchase program did not obligate the Company to acquire any specific number of shares. At December 31, 2015, the Company had a remaining share repurchase authorization of $264.4 million and no shares were repurchased during 2016.
CEO stock contributions. In the first half of 2015, the CEO contributed an aggregate 5.2 million shares of Class B common stock to the Company without consideration per the terms of a Contribution Agreement dated December 28, 2011, and amended on May 11, 2015, representing all of the then remaining shares subject to the contribution obligations. These shares contributed by the CEO were retired during 2015. Refer to the audited financial statements contained in the Company's 2015 Annual Report.