Stock Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012
Stock Repurchases
Repurchase of common stock, authorized amount	$ 20,000
Repurchase of common stock, remaining authorized amount		$ 12,467
Shares repurchased		0	0