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FAIR VALUE MEASUREMENTS, Quantitative Information and Reconciliation - Level 3 Assets and Liabilities (Details)

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FAIR VALUE MEASUREMENTS, Quantitative Information and Reconciliation - Level 3 Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Contingent Consideration [Member]
 
Summary of quantitative information about the company's level three assets and liabilities [Abstract]  
Contingent Consideration Valuation technique Discounted cash flow
Projection of future results range, minimum $ 1,359
Projection of future results range, maximum 17,879
Projection of future results, weighted average 7,721
Discount rate (minimum) (in hundredths) 4.00%
Discount rate (maximum) (in hundredths) 15.00%
Weighted average discount rate used in calculating contingent consideration (in hundredths) 13.00%
Probability of contract extension (in hundredths) 95.00% [1]
Fair value assets measured on recurring basis unobservable input reconciliation [Roll Forward]  
The amount of total gains and losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held 161
Fair value liabilities measured on recurring basis unobservable input reconciliation [Roll Forward]  
Beginning Balance (8,363)
Total gains and losses (realized/unrealized) included in earnings (156)
Settlements 750
Ending Balance (7,769)
Stock Options [Member]
 
Stock Options in a Company Valuation Techniques Used [Abstract]  
Stock Option Held, Valuation Technique Black-Scholes option model
Volatility (In hundredths) 40.00% [2]
Fair value assets measured on recurring basis unobservable input reconciliation [Roll Forward]  
Beginning Balance 1,060
Total gains and losses (realized/unrealized) included in earnings 638
Settlements 0
Ending Balance 1,698
The amount of total gains and losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held $ 638
[1] Represents the probability of contract extension used in the valuation analysis that the Company has determined market participants would use when valuing certain contingent consideration liabilities which include lease renewals.
[2] Represents the volatility expected to be used by market participants in the absence of historical volatility.