Restructuring Charges (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges related to severance	$ 362,000	$ 0	$ 671,000	$ 445,000
Restructuring reserve, current	1,700,000		1,700,000
Restructuring reserve, noncurrent	100,000		100,000
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, noncurrent	$ 1,200,000		$ 1,200,000