Restructuring Costs and Other, Net (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2013 employees	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Number of Positions Eliminated	66
Restrucruting and Related Cost Expected Cost Year One		$ 4,300,000
Payments for Restructuring		1,000,000	800,000	300,000
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		1,009,000
Expenses, Net		6,262,000
Cash		(1,841,000)
Noncash		(84,000)	300,000
Restructuring Reserve, End of Period		5,346,000	1,009,000
Leipzig Closure and Other Associated Costs [Member]
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		1,009,000
Expenses, Net		0
Cash		0
Noncash		0
Restructuring Reserve, End of Period		1,009,000
Leipzig Closure 2011 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			200,000	2,200,000
Expenses, Net			200,000	2,200,000
2013 workforce reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		6,300,000
Expenses, Net		6,300,000
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		0
Cash		(1,841,000)
Noncash		84,000
Restructuring Reserve, End of Period		$ 4,337,000