Capital Stock	3 Months Ended
Mar. 31, 2017
Class of Stock Disclosures [Abstract]
Capital Stock	Note 9. Capital Stock Class A and B common stock Holders of Class B shares may, at their option, convert their shares into Class A shares at the rate of 2,400 Class A shares per Class B share. There were no shares of Class B common stock converted into Class A common stock during the three months ended March 31, 2017 and the year ended December 31, 2016. There is no provision for conversion of Class A shares to Class B shares, and Class B shares surrendered for conversion cannot be reissued. Stock repurchases In October 2011, our Board of Directors approved a continuation of the current stock repurchase program for a total of $150 million, with no time limitation. There were no shares repurchased under this program during the three months ended March 31, 2017 and the year ended December 31, 2016. We had approximately $17.8 million of repurchase authority remaining under this program at March 31, 2017. During the three months ended March 31, 2017, we purchased 6,447 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $0.7 million. Of this amount, we purchased 3,785 shares of our outstanding Class A nonvoting common stock at a total cost of $0.4 million, or $111.55 per share, for stock-based awards in conjunction with our equity compensation plan. These shares were delivered to plan participants in January 2017. The remaining 2,662 shares of our outstanding Class A nonvoting common stock were purchased at a total cost of $0.3 million, or $118.69 per share, to fund the rabbi trust for the outside director deferred compensation plan. These shares were transferred to the rabbi trust in March 2017.

Note 9. Capital Stock

Class A and B common stock

Holders of Class B shares may, at their option, convert their shares into Class A shares at the rate of 2,400 Class A shares per Class B share. There were no shares of Class B common stock converted into Class A common stock during the three months ended March 31, 2017 and the year ended December 31, 2016. There is no provision for conversion of Class A shares to Class B shares, and Class B shares surrendered for conversion cannot be reissued.

Stock repurchases

In October 2011, our Board of Directors approved a continuation of the current stock repurchase program for a total of $150 million, with no time limitation. There were no shares repurchased under this program during the three months ended March 31, 2017 and the year ended December 31, 2016. We had approximately $17.8 million of repurchase authority remaining under this program at March 31, 2017.

During the three months ended March 31, 2017, we purchased 6,447 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $0.7 million. Of this amount, we purchased 3,785 shares of our outstanding Class A nonvoting common stock at a total cost of $0.4 million, or $111.55 per share, for stock-based awards in conjunction with our equity compensation plan. These shares were delivered to plan participants in January 2017. The remaining 2,662 shares of our outstanding Class A nonvoting common stock were purchased at a total cost of $0.3 million, or $118.69 per share, to fund the rabbi trust for the outside director deferred compensation plan. These shares were transferred to the rabbi trust in March 2017.