Common Stock Repurchase Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Common Stock Repurchase Plan [Abstract]
Common shares repurchased to treasury during period (in shares)	120
Aggregate cost of shares repurchased during period	$ 133
Total number of common shares authorized for repurchase (in shares)	10,000
Total number of common shares repurchased (in shares)	3,800
Total number of shares that may still be repurchased (in shares)	6,200