Capital Stock	6 Months Ended
Jun. 30, 2015
Equity [Abstract]
Common Stock	Capital Stock The Company had 21,720,287 shares of Class A common stock and 23,786,296 shares of Class B common stock outstanding as of June 30, 2015. The Company had 21,928,932 shares of Class A common stock and 23,859,483 shares of Class B common stock outstanding as of December 31, 2014. During the six months ended June 30, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in open market transactions at an aggregate purchase price of $14,674. During the six months ended June 30, 2014, the Company repurchased and retired 325,418 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $8,143. 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 434,125 shares of its Class A common stock. All other stock repurchases during the three and six months ended June 30, 2015 and 2014 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's 2006 Equity Compensation Plan. On April 3, 2015, the Company filed a Registration Statement on Form S-8 to register an additional 2,000,000 shares of Class A common stock to be issued pursuant to the Company's 2015 Equity and Incentive Plan.

Capital Stock

6 Months Ended

Jun. 30, 2015

Capital Stock

The Company had 21,720,287 shares of Class A common stock and 23,786,296 shares of Class B common stock outstanding as of June 30, 2015. The Company had 21,928,932 shares of Class A common stock and 23,859,483 shares of Class B common stock outstanding as of December 31, 2014.

During the six months ended June 30, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in open market transactions at an aggregate purchase price of $14,674. During the six months ended June 30, 2014, the Company repurchased and retired 325,418 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $8,143. 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 434,125 shares of its Class A common stock. All other stock repurchases during the three and six months ended June 30, 2015 and 2014 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's 2006 Equity Compensation Plan.

On April 3, 2015, the Company filed a Registration Statement on Form S-8 to register an additional 2,000,000 shares of Class A common stock to be issued pursuant to the Company's 2015 Equity and Incentive Plan.