Discontinued operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Discontinued Operations [Abstract]
Revenue of QCC and AMP	$ 221	$ 256	$ 899	$ 901
Loss from operations of QCC and AMP	(285)	(291)	(895)	(790)
Income tax benefit	97	88	304	240
Net loss from operations of QCC and AMP	(188)	(203)	(591)	(550)
Loss on disposal of QCC and AMP	(397)		(804)
Income tax benefit	135		274
Net loss from disposal of QCC and AMP	(262)		(530)
Loss from discontinued operation	$ (450)	$ (203)	$ (1,121)	$ (550)

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.

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- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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