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Debt (Schedule of Debt) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Debt:
Total debt	$ 205,102		$ 197,232
Less: current portion	(22,213)		(12,187)
Total long-term debt, net	182,889		185,045
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities
Debt:
Debt, maturity	Dec - 2016
Senior Notes [Member]
Debt:
Long-term debt	173,471	[1]	173,061	[1]
Debt, maturity	Oct - 2017	[1]
Long-term debt, weighted average interest rate	9.50%	[1]
PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt	13,454		4,822
Debt:
Debt, maturity	Various 2014
PST Short-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	12.48%
PST Short-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	2.56%
PST Long-Term Notes [Member]
Debt:
Long-term debt	15,455		16,896
Debt maturity period range start	2014
Debt maturity period range end	2019
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	5.50%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	4.00%
Other [Member]
Debt:
Total debt	1,271		966
Suzhou Note [Member]
Debt Instrument [Line Items]
Short-term debt	$ 1,451		$ 1,487
Debt:
Debt, maturity	Aug - 2014
Long-term debt, weighted average interest rate	7.39%
[1] Interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.

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Latest period the outstanding debt instruments are required to be repaid.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations.

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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