Income Taxes Reconciliation fo Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Net	$ 735	$ 7,350
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, at beginning of year	6,271	7,790
Reductions for tax positions-prior years		(6)
Additions for tax positions-current year	11,442	440
Expiration of statute of limitiations	(7,332)	(1,953)
Balance, at end of year	$ 10,381	$ 6,271