Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2012
Income Taxes [Abstract]
Increase in Deferred tax asset				$ 21,674
Understatement in Deferred tax asset account			21,674
Additional income tax benefit resulting from correction, amount		21,674
IRS audit, additional federal income taxes	12,747
IRS audit, interest paid	1,702
IRS audit, additional income tax expense	752
IRS audit, decrease in reserve for uncertain tax positions, interest related	1,567
IRS audit, decrease in reserve for uncertain tax positions	9,657
IRS audit, income tax benefit	$ 11,223