Capital Stock (Tables)

12 Months Ended

Dec. 31, 2017

Capital Stock

Schedule of options exercisable and their respective weighted average exercise prices per share

		Weighted‑
	Exercisable	Average
	(in thousands)	Exercise Price
December 31, 2017	7,996	$	12.16
December 31, 2016	7,898	$	13.15
June 30, 2016	6,453	$	12.63
June 30, 2015	5,380	$	11.89