Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Issuance of common stock tax benefits	$ 5	$ 16	$ 47
Cash dividends	$ 0.72	$ 0.72	$ 0.72
Common Stock [Member]
Issuance of common stock tax benefits	5	16	47
Additional Paid-in Capital [Member]
Issuance of common stock tax benefits	$ 5	$ 16	$ 47
Retained Earnings [Member]
Cash dividends	$ 0.72	$ 0.72	$ 0.72