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Income Taxes - Unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the beginning and ending amount of unrecognized tax benefits:
Balance, beginning of year	$ 748	$ 569
Additions based on tax positions related to the current year	428	219
Additions based on tax positions related to the prior year	113	(40)
Additions based on taxing authority examination	997	0
Settlements with taxing authorities	(997)	0
Balance, end of year	1,289	748
Total amount of tax benefits that if recognized would favorable impact the effective tax rate	872	520
Interest and penalties accrued	$ 58	$ 52

X

- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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