Income Taxes Income Taxes-Unrecognized Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 1,057	$ 4,003	$ 1,337
Additions based on tax positions related to the current year	347	311	270
Additions for tax positions of prior years	49	38	2,884
Reductions for tax positions of prior years	0	(2,849)	0
Settlements or lapse of statute of limitations	(305)	(446)	(488)
Balance at end of year	$ 1,148	$ 1,057	$ 4,003