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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Consolidated Accounts Receivable Percentage |  |  | 10.00% |  | 10.00%
Consolidated Largest Client Revenue | 10.00% | 10.00% | 10.00% | 10.00% |
Restricted Cash and Cash Equivalents, Noncurrent | $ 45 |  | $ 45 |  | $ 47
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation | 2,011 | 3,967 | 4,308 | 6,495 |
Business Combination, Acquisition Related Costs | 556 | 930 | 1,092 | 1,670 |
Assets | 1,389,443 | 1,393,437 | 1,389,443 | 1,393,437 | 1,344,945
Liabilities | 1,406,085 |  | 1,406,085 |  | 1,311,802
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 351,104 |  |
Aggregate Grant Date Fair Value |  |  | 5,071 |  |
Common Class A [Member] |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 603,819 |  |
Doner [Member] |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  | 30.00% |  |
Ownership Interest Percentage Increase On Exercise Of Option |  |  | 70.00% |  |
Assets | 239,492 |  | 239,492 |  |
Liabilities | $ 197,871 |  | $ 197,871 |  |

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- Definition The change in the estimated value of contingent purchase price obligations that are remeasured and adjusted through operating profit. + References No definition available. + Details
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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 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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