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Discontinued operations - Summary of discontinued operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Discontinued Operations [Abstract]
Revenue of QCC and AMP		$ 303
Loss from operations of QCC and AMP		(312)
Income tax benefit		100
Net loss from operations of QCC and AMP		$ (212)

- Definition

Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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- Definition

After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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- Definition

Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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