Commitments and Contingencies Schedule of minimum lease payments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Future Minimum Payments, 2013	$ 3,774
Operating Leases, Future Minimum Payments, 2014	2,539
Operating Leases, Future Minimum Payments, 2015	1,932
Operating Leases, Future Minimum Payments, 2016	1,680
Operating Leases, Future Minimum Payments, 2017	1,449
Operating Leases, Future Minimum Payments, Thereafter	1,041
Operating Leases, Future Minimum Payments	12,415
Capital Leases, Future Minimum Payments, 2013	107
Capital Leases, Future Minimum Payments, 2014	35
Capital Leases, Future Minimum Payments , 2015	5
Capital Leases, Future Minimum Payments, 2016	5
Capital Leases, Future Minimum Payments	152
Capital Leases, Future Minimum Payments, Interest Included in Payments	5
Capital Leases, Present Value of Minimum Payments	147
Capital Lease Obligations, Current	104
Capital Lease Obligations, Noncurrent	$ 43