Restructuring Charges (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 756,000	$ 1,350,000	$ 768,000	$ 1,967,000
Restructuring reserve, current	500,000		500,000
Restructuring reserve, noncurrent	300,000		300,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	400,000	500,000	400,000	1,100,000
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 400,000	$ 900,000	$ 400,000	$ 900,000