Capital Stock - Stock Repurchase Program (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Capital Stock [Abstract]
Stock Repurchase Program Authorization Date	Jul. 29, 2015
Share Repurchase	2,000,000
Stock Repurchase Program, Cumulative Shares Repurchased	1,216,243
Stock Repurchase Program Cumulative Cost | $	$ 10,800,000
Stock Repurchase Program Weighted Average Price Cumulative | $ / shares	$ 8.92