Capital Stock	6 Months Ended
Jun. 30, 2016
Equity [Abstract]
Common Stock	Capital Stock The Company had 21,131,759 shares of Class A common stock and 23,614,455 shares of Class B common stock outstanding as of June 30, 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 six months ended June 30, 2016, the Company repurchased and retired 975,877 shares of its Class A common stock in open market transactions at an aggregate purchase price of $25,525. During the six months ended June 30, 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. 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 six months ended June 30, 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

6 Months Ended

Jun. 30, 2016

Capital Stock

The Company had 21,131,759 shares of Class A common stock and 23,614,455 shares of Class B common stock outstanding as of June 30, 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 six months ended June 30, 2016, the Company repurchased and retired 975,877 shares of its Class A common stock in open market transactions at an aggregate purchase price of $25,525. During the six months ended June 30, 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. 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 six months ended June 30, 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.