Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		6 Months Ended
	Feb. 19, 2016	Jun. 30, 2016	Jun. 30, 2015
Common Shares
Shares repurchased		0.3
Total aggregate amount of shares purchased		$ 1,687
Common shares
Common stock dividend declared (in dollars per share)	$ 0.06
Cash dividends paid		$ 16,922	$ 34,980