Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 2,878	$ 1,358
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	42	0
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	260	74
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	(81)
Tax liability adjustments	0	(18)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	(1,057)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(169)
Unrecognized Tax Benefits	3,011	2,878
Continuous Computing [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Tax liability adjustments		$ 2,602