Share Capital (Tables)

6 Months Ended

Jun. 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 June 30,			For the Six Months Ended June 30,
	2018	2017		2018	2017
Class A Stock outstanding, beginning of period	13,141,103	13,182,332		13,139,203	13,261,095
Issued pursuant to shared-based compensation plans	15,250	—		17,150	179,020
Repurchased and canceled pursuant to the stock buy-back	—	(49,557	)	—	(307,340	)
Class A Stock outstanding, end of period	13,156,353	13,132,775		13,156,353	13,132,775