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Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Consolidated Accounts Receivable Percentage | 10.00% |  | 10.00%
Consolidated Largest Client Revenue | 10.00% | 10.00% |
Restricted Cash and Cash Equivalents, Noncurrent | $ 46 |  | $ 47
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation | 2,296 | 2,528 |
Business Combination, Acquisition Related Costs | 536 | 740 |
Assets | 1,418,509 | 1,338,610 | 1,344,945
Liabilities | 1,430,909 |  | 1,311,802
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 201,739 |  |
Aggregate Grant Date Fair Value | 2,608 |  |
Common Class A [Member] |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 514,353 |  |
Doner [Member] |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 30.00% |  |
Ownership Interest Percentage Increase On Exercise Of Option | 70.00% |  |
Assets | 234,715 |  |
Liabilities | $ 203,328 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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