Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Details of the beginning and ending amount of gross unrecognized tax benefits
Balance at beginning of year	$ 628	$ 628	$ 628
Gross increases for tax positions of prior years	0	0	0
Gross decreases for tax positions of prior years	0	0	0
Settlements	0	0	0
Lapse of statute of limitations	0	0	0
Balance at end of year	$ 628	$ 628	$ 628