Share Capital (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Changes in Number of Shares of Class A Stock Outstanding

The following table reflects changes in the number of shares of Class A Stock outstanding for the periods indicated:

	For the Three Months Ended September 30,			For the Nine Months Ended September 30,
	2018	2017		2018	2017
Class A Stock outstanding, beginning of period	13,156,353	13,132,775		13,139,203	13,261,095
Issued pursuant to share-based compensation plans	21,578	19,883		38,728	198,903
Repurchased and canceled pursuant to the stock buy-back	—	(143,010	)	—	(450,350	)
Class A Stock outstanding, end of period	13,177,931	13,009,648		13,177,931	13,009,648