Subsequent Event (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2015
Subsequent Event [Line Items]
Payments for Repurchase of Common Stock	$ 12,321	$ 1,328	$ 1,656
Subsequent Event
Subsequent Event [Line Items]
Stock Repurchased				141,462
Payments for Repurchase of Common Stock				$ 3,800