Capital Stock Par Value of Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 10, 2004
Stockholders' Equity Note [Abstract]
Common stock stated value per share	$ 20	$ 20
Common stock shares subscribed but unissued	964,300
Common stock subscriptions (shares)	660,775
Common shares subscribed	$ 13,215	$ 12,219
Shares Purchased and Retired [Abstract]
Shares of Common Stock, Purchased	558,599	463,189	522,405
Shares of Common Stock, Retired	658,890	474,219	520,458
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	20.00%	10.00%	10.00%