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Retirement of Treasury Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2013 Common Stock [Member]	Mar. 31, 2013 Treasury Stock [Member]	Mar. 31, 2013 Retained Earnings [Member]	Mar. 31, 2013 Paid-in Capital [Member]
Retirement of Treasury Stock [Abstract]
Retired shares of treasury stock (in shares)	1,141,400
Equity, Class of Treasury Stock [Line Items]
Reductions due to retirement of treasury stock		$ 1,141	$ 42,905	$ 18,845	$ 22,919

Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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