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