Earnings per Share (Details Textual) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jul. 23, 2014
Earnings Per Share [Abstract]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Share repurchase program, maximum amount			$ 150,000,000
Shares repurchased, shares	2.5	3.2
Aggregate cost of share repurchases	$ 35,600,000	$ 75,000,000
Shares repurchased, in dollar per share	$ 14.25	$ 23.28
Share repurchase program, remaining authorized repurchase amount	$ 39,400,000