Share Capital (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Class A Stock outstanding, beginning of period	13,182,332		13,263,532		13,261,095		13,238,486
Issued pursuant to shared-based compensation plans	—		7,163		179,020		272,483
Repurchased and canceled pursuant to the stock buy-back	(49,557	)	(10,980	)	(307,340	)	(251,254	)
Class A Stock outstanding, end of period	13,132,775		13,259,715		13,132,775		13,259,715