Common Stock Repurchase Plan (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Common Stock Repurchase Plan [Abstract]
Common shares repurchased to treasury during period (in shares)	913
Aggregate cost of shares repurchased during period	$ 1,087
Total number of common shares authorized for repurchase (in shares)	10,000
Total number of common shares repurchased (in shares)	4,593
Total number of shares that may still be repurchased (in shares)	5,407