Restructuring Costs and Other, Net (Details) (USD $)	1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 28, 2013 employees	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Number of Positions Eliminated	66
Restructuring Charges		$ 6,358,000
Payments for Restructuring		5,483,000	800,000	300,000
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		1,009,000
Expenses, Net		6,358,000
Cash		(5,483,000)	(800,000)	(300,000)
Noncash		(1,265,000)	(300,000)
Restructuring Reserve, End of Period		619,000	1,009,000
Leipzig Closure and Other Associated Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		0
Payments for Restructuring		0
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		1,009,000
Expenses, Net		0
Cash		0
Noncash		(1,009,000)
Restructuring Reserve, End of Period		0
Leipzig Closure 2011 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			200,000	2,200,000
Employee serverance and other personnel benefits:
Expenses, Net			200,000	2,200,000
2013 workforce reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		6,358,000
Restrucruting and Related Cost Expected Cost Year One		600,000
Payments for Restructuring		5,483,000
Employee serverance and other personnel benefits:
Restructuring Reserve, Beginning of Period		0
Expenses, Net		6,358,000
Cash		(5,483,000)
Noncash		(256,000)
Restructuring Reserve, End of Period		$ 619,000