Subsequent Events (Details) (USD $)	12 Months Ended			2 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 10, 2015	Jul. 31, 2014	Oct. 31, 2011	Feb. 28, 2015
Subsequent Event [Line Items]
Share repurchase program, approved increase					$ 15,000,000
Share repurchase program, amount authorized	65,500,000					50,500,000
Stock repurchased and retired, shares	3,822,434	2,404,034	4,709,651
Stock repurchased and retired, value	24,400,000	12,519,000	24,836,000
Share repurchase program, remaining amount authorized	300,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, approved increase							15,000,000
Share repurchase program, amount authorized							80,500,000
Stock repurchased and retired, shares				28,651
Stock repurchased and retired, value				300,000
Share repurchase program, remaining amount authorized				$ 15,000,000