Restructurings and Lease Terminations (Schedule of Accrual and Usage of Restructuring Charges) (Details) (USD $)	1 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Reserve [Roll Forward]
Beginning balance			$ 300,000	$ 800,000	$ 1,700,000
Restructuring charge			4,886,000	0	454,000
Cash payments			(1,300,000)	(500,000)	(1,400,000)
Ending balance	3,900,000		3,900,000	300,000	800,000
Current portion of accrued restructuring	3,430,000		3,430,000	307,000
Long-term portion of accrued restructuring	500,000		500,000
Leases [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			0	100,000	300,000
Restructuring charge	700,000	500,000	700,000		0
Cash payments			(100,000)	(100,000)	(200,000)
Ending balance	600,000	300,000	600,000	0	100,000
Current portion of accrued restructuring	100,000		100,000
Long-term portion of accrued restructuring	500,000		500,000
Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			300,000	700,000	1,400,000
Restructuring charge			4,200,000		500,000
Cash payments			(1,200,000)	(400,000)	(1,200,000)
Ending balance	3,300,000		3,300,000	300,000	700,000
Current portion of accrued restructuring	3,300,000		3,300,000
Long-term portion of accrued restructuring	$ 0		$ 0