Capital Stock Par Value of Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 10, 2004
Stockholders' Equity Note [Abstract]
Common stock stated value per share	$ 20	$ 20
Common Stock, shares authorized	50,000,000	20,000,000
Common stock subscriptions (shares)	744,241
Common shares subscribed	$ 14,885	$ 13,215
Shares Purchased and Retired [Abstract]
Shares of common stock, purchased	638,647	558,599	463,189
Shares of common stock, retired	681,637	658,890	474,219
Preferred stock shares authorized				10,000,000
Preferred stock par or stated value per share				$ 0.01
Preferred stock outstanding	0	0
Common stock dividend declared, percent	2.50%	20.00%	10.00%