Segment Information Summary of consolidated total assets by segment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 538,160	$ 533,378
Thin Films [Member]
Segment Reporting Information [Line Items]
Assets	40,965	59,025
Solar Energy [Member]
Segment Reporting Information [Line Items]
Assets	76,393	62,605
Unallocated Corporate Propert and Equipment [Member]
Segment Reporting Information [Line Items]
Assets	3,647	991
Unallocated Corporate Assets [Member]
Segment Reporting Information [Line Items]
Assets	417,155	410,757
Consolidated Assets [Member]
Segment Reporting Information [Line Items]
Assets	538,160	533,378
Inventories and Property and Equipment [Member]
Segment Reporting Information [Line Items]
Assets	$ 117,358	$ 121,630