Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2015	Jan. 30, 2015	Dec. 31, 2014
BTU International, Inc (BTU) Merger
Debt Instrument [Line Items]
Long-term debt acquired		$ 7.2
Long-term debt	$ 7.0
Interest rate		4.40%
SoLayTec, B.V.
Debt Instrument [Line Items]
Long-term debt acquired			$ 2.0
Long-term debt	$ 2.3
SoLayTec, B.V. \| Minimum
Debt Instrument [Line Items]
Interest rate	5.95%
SoLayTec, B.V. \| Maximum
Debt Instrument [Line Items]
Interest rate	10.00%