Intangible Assets (Other Disclosure) (Details) (USD $)	3 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	May 31, 2012
Segment Reporting Information [Line Items]
Intangible assets, net, sold to SEI									$ 500,000
Impairments	0	1,425,000	0	0	1,400,000	0	1,425,000	8,000,000
Impairment of tangible assets				5,300,000	1,100,000
Impairment of intangible assets				2,700,000	300,000
Long-lived assets	71,708,000					72,287,000	71,708,000
Fiber Optics
Segment Reporting Information [Line Items]
Long-lived assets	24,209,000					23,804,000	24,209,000
Digital Fiber Optics [Member]
Segment Reporting Information [Line Items]
Long-lived assets								$ 17,100,000