Commitments and Contingencies, Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Operating leases due 2013	$ 2,896,000
Operating leases due 2014	2,069,000
Operating leases due 2015	1,509,000
Operating leases due 2016	1,400,000
Operating leases due 2017	671,000
Operating leases due Thereafter	1,157,000
Operating leases Total	9,702,000
Purchase obligations due 2013	650,000
Purchase obligations due 2014	638,000
Purchase obligations due 2015	0
Purchase obligations due 2016	0
Purchase obligations due 2017	0
Purchase obligations due Thereafter	0
Purchase obligations Total	1,288,000
Total due 2013	3,546,000
Total due 2014	2,707,000
Total due 2015	1,509,000
Total due 2016	1,400,000
Total due 2017	671,000
Total due Thereafter	1,157,000
Total	10,990,000
Operating Leases
Total operating lease expense	3,700,000	3,100,000	2,800,000
Total service agreement expense	$ 1,300,000	$ 200,000	$ 0
Operating leases
Operating Leases
Remaining term of leases (years)	21 years