Commitments and Contingencies (Future Minimum Rental Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Future Minimum Rental Payments [Line Items]
2013	$ 3,332,000
2014	2,881,000
2015	2,407,000
2016	1,403,000
2017	567,000
2018 and thereafter	120,000
Total	10,710,000
Rent Expense	$ 3,100,000	$ 2,400,000	$ 2,000,000