Summary Of Significant Accounting Policies And Recent Accounting Standards (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended
	Jul. 31, 2013 contract	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty reserve		$ 1,300,000		$ 1,300,000
Pre-tax share-based compensation expense		$ 300,000	$ 100,000
Number of interest rate swap contracts	2
Purchased Software And Software Development Costs [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Finite-lived intangible assets, useful life		5 years
Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Estimated useful lives		30 years
Maximum [Member] | Patents And Licensing Agreements [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Finite-lived intangible assets, useful life		5 years
Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Estimated useful lives		3 years
Minimum [Member] | Patents And Licensing Agreements [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Finite-lived intangible assets, useful life		3 years
Distributed Generation, Switchgear And Utility Infrastructure Equipment [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		1 year
LED Lighting-Based Products [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		10 years
LED Lighting-Based Products [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		5 years
Defects In Material And Workmanship [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		5 years
Defects In Material And Workmanship [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		1 year
Declines In Power Performance [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		20 years
Declines In Power Performance [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		10 years
Functionality Of Solar Panels [Member] | Maximum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		25 years
Functionality Of Solar Panels [Member] | Minimum [Member]
Summary Of Significant Accounting Policies And Recent Accounting Standards [Line Items]
Warranty period		15 years