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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 15, 2014	Oct. 04, 2010
Debt Instrument [Line Items]
Credit facility	$ 100,000	$ 100,000	$ 100,000
Debt:
Total debt	18,363	30,306
Long-term debt	118,363
Less: current portion	(13,905)	(19,655)
Total long-term debt, net	4,458	10,651
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility	$ 100,000	100,000
Debt:
Debt interest rate	1.86%
Debt, maturity	September 2019
Senior Notes [Member]
Debt:
Debt interest rate				9.50%
PST Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term obligations	$ 11,556	11,249
Debt:
Debt, maturity	2016
PST Short-Term Obligations [Member] | Maximum [Member]
Debt:
Interest rate maximum	19.31%
PST Short-Term Obligations [Member] | Minimum [Member]
Debt:
Interest rate minimum	5.50%
PST Long-Term Notes [Member]
Debt:
Long-term debt	$ 6,428	16,770
Debt maturity period range start	2016
Debt maturity period range end	2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	8.00%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	6.17%
Other [Member]
Debt:
Total debt	$ 379	837
Suzhou Note [Member]
Debt Instrument [Line Items]
Short-term obligations		$ 1,450
Debt:
Debt, maturity	April 2015

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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, and capital lease obligations.

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