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Fair Value Measurement (Details 1) (Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member], Contingent earnout consideration [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] \| Contingent earnout consideration [Member]
Reconciliation of the beginning and ending Level 3 net liabilities
Beginning balance		$ 231
Change in fair value related to Meridian contingent earnout consideration		(231)
Ending balance

Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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