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Capital Stock
3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Common Stock
Capital Stock
    
The Company had 21,926,590 shares of Class A common stock and 23,217,418 shares of Class B common stock outstanding as of March 31, 2017. The Company had 21,613,885 shares of Class A common stock and 23,312,291 shares of Class B common stock outstanding as of December 31, 2016.
    
During the three months ended March 31, 2017, the Company did not repurchase any shares of its Class A common stock. During the three months ended March 31, 2016, the Company repurchased and retired 948,242 shares of its Class A common stock in open market transactions at an aggregate purchase price of $24,792. All repurchases were made pursuant to stock repurchase programs approved by the Company's Board of Directors. Under the terms of the current stock repurchase program, the Company may repurchase up to an additional 24,123 shares of its Class A common stock. All other stock repurchases during the three months ended March 31, 2017 and 2016 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants in the Company's equity compensation plans.