Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in our liability for unrecognized gross tax benefits
Balance at beginnng of year	$ 3,821	$ 5,002
Tax position of current year	160	289	670
Tax position of prior years	763	259	664
Statute expirations	(595)	(1,244)	(1,630)
Settlements	0	0	(766)
Tax positions of prior years	(80)	(851)	(119)
Balance at end of year	2,274	3,821	5,002
Balance at beginnng of year	3,821	5,002
Tax position of current year	160	289	670
Tax position of prior years	763	259	664
Statute expirations	(595)	(1,244)	(1,630)
Settlements	0	0	(766)
Tax positions of prior years	(80)	(851)	(119)
Balance at end of year	$ 2,274	$ 3,821	$ 5,002