Income Taxes Reconciliation fo Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Net	$ 2,809	$ 735
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance December 31, 2010	10,381	6,271
Additions	2,793	11,442
Expiration of statute of limitations		(7,332)
Reductions	(3,285)
Balance December 31, 2012	$ 9,889	$ 10,381