Discontinued operations - Summary of discontinued operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations [Abstract]
Revenue of QCC and AMP	$ 1,002	$ 1,282
Loss from operations of QCC and AMP	(948)	(1,504)
Income tax benefit	301	471
Net loss from operations of QCC and AMP	(647)	(1,033)
Loss on operations of QCC and AMP	(998)
Income tax benefit	318
Net loss on operations of QCC and AMP	(680)
Loss from discontinued operations	$ (1,327)	$ (1,033)

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

+ References+ Details

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

+ References+ Details

- 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.

+ References+ Details

- 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.

+ References+ Details

- Definition

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

+ References+ Details

- Definition

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

+ References+ Details

- 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.

+ References+ Details