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Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Accounts Receivable Percentage | 10.00% | 10.00% |
Consolidated Largest Client Revenue | 10.00% | 10.00% | 10.00%
Restricted Cash and Cash Equivalents, Noncurrent | $ 47 | $ 46 |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  | 3,519
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  | 2,601
Cost Method Investments | 10,733 | 8,785 |
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation | 53,027 | 12,623 | 778
Business Combination, Acquisition Related Costs | 3,364 | 3,819 | 4,025
Interest Rate Percentage on Senoir Notes | 11.00% |  |
Amortization of Debt Discount (Premium) | 1,366 | 943 | 197
Investment Income, Amortization of Premium | 46 | 232 | 848
Deferred Finance Costs, Net | 11,653 | 11,715 |
Accumulated Amortization, Deferred Finance Costs | 5,821 | 3,526 |
Deferred financing costs | 2,232 |  |
Pension Expense | 4,090 | 2,356 | 1,655
Total assets | 1,344,945 | 1,055,745 | 914,348
Total Liabilities | 1,311,802 | 961,254 |
Doner [Member] |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 30.00% |  |
Ownership Interest Percentage Increase On Exercise Of Option | 70.00% |  |
Total assets | 220,528 |  |
Total Liabilities | 198,419 |  |
Adrenalina [Member] |  |  |
Equity Method Investment, Ownership Percentage | 49.90% |  |
Equity Method Investment Written Off |  | 39 | 1,636
Real Estate Joint Venture [Member] |  |  |
Percentage of Undivided Interest | 50.00% |  |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Performance Shares [Member] |  |  |
Stock Granted During Period, Value, Share-based Compensation, Gross | $ 9,838 | $ 20,188 | $ 6,649
Equity Value Appreciation Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 1.20% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  | 31.70% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  | 2 years 11 months 5 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 9.37 |
Maximum Shares Issuance Restricted Stock Units and Shares |  | 1,413,000 |

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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -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. + Details
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- Definition Gross value of stock (or other type of equity) granted during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). This element is not the recognition of equity-based compensation expense in pursuant to FAS 123R. That element is AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue (Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value). + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 + Details
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