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Significant Accounting Policies (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 28, 2012 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Interest Rate Percentage On Senior Notes |  | 6.75% |  |  | 6.75% |  |
Put option noncontrolling interest impairment charge |  |  |  | $ 0 | $ 0 | $ 0 |
Cost Method Investments |  | $ 11,865,000 |  |  | $ 11,865,000 |  | $ 10,196,000
Consolidated Accounts Receivable Percentage |  | 10.00% |  |  | 10.00% |  | 10.00%
Consolidated Largest Client Revenue |  | 10.00% |  | 10.00% | 10.00% | 10.00% |
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation |  | $ (12,741,000) |  | $ 4,071,000 | $ (10,493,000) | $ 12,093,000 |
Business Combination, Acquisition Related Costs |  | 842,000 |  | 984,000 | 1,716,000 | 2,055,000 |
Assets |  | 1,848,647,000 |  | 1,685,018,000 | 1,848,647,000 | 1,685,018,000 | $ 1,648,890,000
Liabilities |  | 2,122,430,000 |  |  | $ 2,122,430,000 |  | 1,802,519,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  |  |  | 71,155 |  |
Restricted stock grant date fair value |  |  |  |  | $ 1,571 |  |
Adjustment to deferred acquisition consideration included in interest expense |  | $ 377 |  | $ 493 | $ 930 | $ 862 |
Common Class A |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Aggregate Non-Vested, Shares, Restricted Stock Issued, Gross |  | 717,717 |  |  | 717,717 |  |
Doner [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 30.00% |  |  |  |  |  |
Assets |  | $ 148,205,000 |  |  | $ 148,205,000 |  | 223,305,000
Liabilities |  | $ 112,971,000 |  |  | $ 112,971,000 |  | $ 192,340,000
Aggregate 2012 Acquisitions [Member] | Doner [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership Interest Percentage Increase On Exercise Of Option | 70.00% |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  | 50.00% |  |
Maximum [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 7 years |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  | 50.00% |  |
Real Estate Joint Venture [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage Of Undivided Interest |  | 30.00% |  |  | 30.00% |  |

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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 + Details
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