Treasury Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Shares repurchased (in shares)	153,000	201,000	457,000
Cost of shares repurchased	$ 3,607	$ 3,451	$ 9,785
Treasury stock reissued (in shares)	30,000	37,500	30,000
Shares available for repurchase (in shares)	933,456