Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 0	$ 1,346	$ 1,601	$ 3,383
Additions for tax positions of prior years	0	39	99
Reductions for tax positions of prior years	$ (1,346)	$ (294)	$ (1,881)