Purchase of Common Shares (Details) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2014	Jun. 30, 2015
Stock Repurchase Program [Abstract]
Stock repurchase program, authorized amount	$ 40,000,000
Stock repurchase program, expected duration	5 years
Stock repurchased during period, shares		350,000
Stock repurchased during period, average (USD per share)		$ 8.83