Discontinued Operations (Narrative) (Details) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 22, 2015	Dec. 10, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015	Apr. 17, 2015	Apr. 16, 2015	Jan. 02, 2015	Oct. 22, 2014	Sep. 17, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incentive tax credits				$ 100,000	$ 0
Proceeds from sale of venture	$ 700,000
Book value of outstanding receivables	$ 0
Payments to terminate lease agreement			$ 200,000	200,000
Gain on lease termination			$ 300,000	$ 310,000	0
Digital Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price										$ 17,500,000
Asset sale, promissory note, principal amount								$ 15,500,000	$ 1,500,000
Accrued interest on note receivable							$ 200,000
Photovoltaics [Member] | Photovoltaics Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price		$ 150,000,000									$ 150,000,000
Working capital adjustment						$ 100,000
Net assets sold		60,300,000
Transaction costs incurred in sale of business		$ 2,700,000
Discontinued Operations [Member] | Photovoltaics [Member] | Photovoltaics Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business					$ 56,800,000