Capital Stock	3 Months Ended
Mar. 31, 2016
Equity [Abstract]
Common Stock	Capital Stock The Company had 21,007,483 shares of Class A common stock and 23,700,002 shares of Class B common stock outstanding as of March 31, 2016. The Company had 21,698,594 shares of Class A common stock and 23,729,631 shares of Class B common stock outstanding as of December 31, 2015. 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. During the three months ended March 31, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $14,674. The 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 51,758 shares of its Class A common stock. All other stock repurchases during the three months ended March 31, 2016 and 2015 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's equity compensation plans.

Capital Stock

3 Months Ended

Mar. 31, 2016

Capital Stock

The Company had 21,007,483 shares of Class A common stock and 23,700,002 shares of Class B common stock outstanding as of March 31, 2016. The Company had 21,698,594 shares of Class A common stock and 23,729,631 shares of Class B common stock outstanding as of December 31, 2015.

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. During the three months ended March 31, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $14,674. The 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 51,758 shares of its Class A common stock. All other stock repurchases during the three months ended March 31, 2016 and 2015 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's equity compensation plans.