Income Taxes Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Income Tax [Abstract]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	$ 4,100	$ 4,100	$ 1,800
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1		9,800	9,500
Additions based on tax positions related to the current year		0	400
Additions for tax positions of prior years		800	0
Reductions for tax positions of prior years	(4,100)	(4,100)	(1,800)
Balance at September 30	$ 6,500	$ 6,500	$ 8,100