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Income taxes (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Income taxes | |||||
| Windfall tax benefits from stock option exercises | $ 2,459 | ||||
| Income tax (benefit) expense | 258 | 1,101 | (382) | 2,468 | |
| Effective tax rate (as a percent) | 35.60% | 27.60% | |||
| Deferred tax assets | 2,394 | 2,394 | |||
| Uncertain tax positions | 392 | 392 | 392 | ||
| Uncertain tax positions, reduction to deferred tax assets | $ 106 | $ 106 | $ 106 | ||
| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the amount of uncertain tax positions, which is a reduction to deferred tax assets that is presented as net of uncertain tax positions in the accompanying consolidated balance sheets. No definition available.
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- Definition
Windfall tax benefits recognized from the exercise of stock options resulting in a reduction of the entity's income tax payable, with a corresponding increase in additional paid-in capital. No definition available.
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