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Significant Accounting Policies (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Consolidated Largest Client Revenue 10.00%   10.00%    
Consolidated Accounts Receivable Percentage 10.00%   10.00%    
Restricted Cash and Cash Equivalents, Noncurrent $ 46   $ 46   $ 46
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation 3,967 2,000 6,495 977  
Business Combination, Acquisition Related Costs 930 644 1,670 1,641  
Variable Interest Entity, Consolidated, Carrying Amount, Assets 216,145   216,145    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 187,118   187,118    
Amortization of Debt Discount (Premium)     8   232
Investment Income, Amortization of Premium     652   943
Deferred Finance Costs, Net 10,746   10,746   11,715
Accumulated Amortization, Deferred Finance Costs 4,611   4,611   3,526
Deferred Financing Costs     116    
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)     875,727    
Aggregate Grant Date Fair Value     $ 11,142    
Doner Partners L L C [Member]
         
Equity Method Investment, Ownership Percentage 30.00%   30.00%    
Percentage of Ownership, Convertible Preferred Interests to Increase Ordinary Voting 70.00%   70.00%    
Common Class A [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 699,736   699,736