Debt (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Short-term debt	$ 0		$ 1,160
Debt:
Long-term debt	199,287		200,236
Less: current portion	(10,858)		(18,925)
Total long-term debt, net	188,429		181,311
Letter Of Credit [Member]
Short-term debt	0		0
Debt:
Debt, Maturity	Dec - 2016
Bcs Revolver [Member]
Short-term debt	0		1,160
Debt:
Debt, Maturity	Feb - 2013
Senior Notes [Member]
Debt:
Long-term debt	172,796	[1]	173,916	[1]
Debt, Maturity	Oct - 2017	[1]
Long-term Debt, Weighted Average Interest Rate	9.50%	[1]
Pst Notes Payable [Member]
Short-term debt	6,098		16,161
Debt:
Long-term debt	18,552		8,155
Debt, Maturity	Various 2013
Debt Instrument Maturity Period Range Start	2014
Debt Instrument Maturity Period Range End	2019
Pst Notes Payable [Member] | Maximum [Member]
Debt:
Long-term Debt, Weighted Average Interest Rate	5.50%
Short-term debt, Weighted Average Interest Rate	9.48%
Pst Notes Payable [Member] | Minimum [Member]
Debt:
Long-term Debt, Weighted Average Interest Rate	4.00%
Short-term debt, Weighted Average Interest Rate	3.13%
Suzhou Long Term Note [Member]
Debt:
Long-term debt	1,466		1,445
Debt, Maturity	Aug - 2013
Long-term Debt, Weighted Average Interest Rate	7.50%
Other [Member]
Debt:
Long-term debt	$ 375		$ 559

[1] Weighted average interest rate excludes the impact of the Company's interest rate swap and the accretion of debt discount.