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Acquisitions Of Businesses (Details) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2015 Company | Oct. 13, 2015 Company | Jun. 01, 2015 Company | Dec. 02, 2013 Company | Jul. 29, 2013 USD ($) | Jul. 29, 2013 USD ($) Company | May. 31, 2013 Company | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date | Oct. 19, 2015 | Oct. 13, 2015 | Jun. 01, 2015 | Dec. 02, 2013 |  |  | May 31, 2013 |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 250,000
Goodwill |  |  |  |  |  |  |  | 843,170 | 834,102 | 834,825
Number of businesses acquired | Company | 1 | 1 | 1 | 1 |  | 1 | 1 |  |  |
Non-cash (income) expense from contingent consideration arrangements |  |  |  |  |  |  |  | $ (464) | $ 606 | $ (6,793)
RepconStrickland |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Jul. 29, 2013 |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  | 100.00% | 100.00% |  |  |  |
Purchase price |  |  |  |  | $ 463,600 |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  | 250,000 |  |  |  |  |
Working capital acquired |  |  |  |  | 35,500 | $ 35,500 |  |  |  |
Other net liabilities acquired |  |  |  |  | 67,100 | 67,100 |  |  |  |
Goodwill |  |  |  |  | 267,800 | 267,800 |  |  |  |
Identifiable intangible assets |  |  |  |  | 227,400 | 227,400 |  |  |  |
Acquired goodwill, tax deductible amount |  |  |  |  | $ 49,000 | $ 49,000 |  |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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