Capital Stock	12 Months Ended
Dec. 31, 2018
Class of Stock Disclosures [Abstract]
Capital Stock	Capital Stock Class A and B common stock We have two classes of common stock: Class A which has a dividend preference and Class B which has voting power and a conversion right. Each share of Class A common stock outstanding at the time of the declaration of any dividend upon shares of Class B common stock shall be entitled to a dividend payable at the same time, at the same record date, and in an amount at least equal to 2/3 of 1.0% of any dividend declared on each share of Class B common stock. We may declare and pay a dividend in respect to Class A common stock without any requirement that any dividend be declared and paid in respect to Class B common stock. Sole shareholder voting power is vested in Class B common stock except insofar as any applicable law shall permit Class A common shareholders to vote as a class in regards to any changes in the rights, preferences, and privileges attaching to Class A 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 in 2018, 2017 or 2016. Stock repurchases Our Board of Directors authorized a stock repurchase program effective January 1, 1999 allowing the repurchase of our outstanding Class A nonvoting common stock. Treasury shares are recorded in the Statements of Financial Position at total cost based upon trade date. There were no shares repurchased under this program during 2018, 2017 or 2016. In 2011, our Board of Directors approved a continuation of the current stock repurchase program for a total of $150 million, with no time limitation. We had approximately $17.8 million of repurchase authority remaining under this program at December 31, 2018, based upon trade date. In 2018, we purchased 27,120 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $3.2 million. Of this amount, we purchased 5,830 shares for $0.7 million, or $117.39 per share, for stock-based awards in conjunction with our equity compensation plan. We purchased 9,285 shares for $1.1 million, or $122.19 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 12,005 shares were purchased at a total cost of $1.4 million, or $119.28 per share, to fund the rabbi trust for the incentive compensation deferral plan. These shares were delivered in 2018. In 2017, we purchased 60,332 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $7.3 million. Of this amount, we purchased 3,785 shares for $0.4 million, or $111.55 per share, for stock-based awards in conjunction with our equity compensation plan. We purchased 9,663 shares for $1.2 million, or $121.85 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 46,884 shares were purchased at a total cost of $5.7 million, or $122.40 per share, for the vesting of stock-based awards in conjunction with our long-term incentive plan. These shares were delivered in 2017. In 2016, we purchased 15,093 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $1.5 million. Of this amount, we purchased 7,432 shares for $0.7 million, or $99.23 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 7,661 shares were purchased at a total cost of $0.8 million, or $98.20 per share, for the vesting of stock-based awards in conjunction with our long-term incentive plan. These shares were delivered in 2016.

Capital Stock

Class A and B common stock

We have two classes of common stock: Class A which has a dividend preference and Class B which has voting power and a conversion right. Each share of Class A common stock outstanding at the time of the declaration of any dividend upon shares of Class B common stock shall be entitled to a dividend payable at the same time, at the same record date, and in an amount at least equal to 2/3 of 1.0% of any dividend declared on each share of Class B common stock. We may declare and pay a dividend in respect to Class A common stock without any requirement that any dividend be declared and paid in respect to Class B common stock. Sole shareholder voting power is vested in Class B common stock except insofar as any applicable law shall permit Class A common shareholders to vote as a class in regards to any changes in the rights, preferences, and privileges attaching to Class A 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 in 2018, 2017 or 2016.

Stock repurchases

Our Board of Directors authorized a stock repurchase program effective January 1, 1999 allowing the repurchase of our outstanding Class A nonvoting common stock. Treasury shares are recorded in the Statements of Financial Position at total cost based upon trade date. There were no shares repurchased under this program during 2018, 2017 or 2016. In 2011, our Board of Directors approved a continuation of the current stock repurchase program for a total of $150 million, with no time limitation. We had approximately $17.8 million of repurchase authority remaining under this program at December 31, 2018, based upon trade date.

In 2018, we purchased 27,120 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $3.2 million. Of this amount, we purchased 5,830 shares for $0.7 million, or $117.39 per share, for stock-based awards in conjunction with our equity compensation plan. We purchased 9,285 shares for $1.1 million, or $122.19 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 12,005 shares were purchased at a total cost of $1.4 million, or $119.28 per share, to fund the rabbi trust for the incentive compensation deferral plan. These shares were delivered in 2018.

In 2017, we purchased 60,332 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $7.3 million. Of this amount, we purchased 3,785 shares for $0.4 million, or $111.55 per share, for stock-based awards in conjunction with our equity compensation plan. We purchased 9,663 shares for $1.2 million, or $121.85 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 46,884 shares were purchased at a total cost of $5.7 million, or $122.40 per share, for the vesting of stock-based awards in conjunction with our long-term incentive plan. These shares were delivered in 2017.

In 2016, we purchased 15,093 shares of our outstanding Class A nonvoting common stock outside of our publicly announced share repurchase program at a total cost of $1.5 million. Of this amount, we purchased 7,432 shares for $0.7 million, or $99.23 per share, to fund the rabbi trust for the outside director deferred stock compensation plan. The remaining 7,661 shares were purchased at a total cost of $0.8 million, or $98.20 per share, for the vesting of stock-based awards in conjunction with our long-term incentive plan. These shares were delivered in 2016.