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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 |  |

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