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Acquisitions (Schedule of Consideration Paid and Net Assets Acquired, Business Acquisitions - Pacer) (Details) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 01, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Identifiable assets acquired and liabilities assumed: |  |  |  |
Goodwill |  |  | $ 1,064,822 | $ 1,082,466
Earn-Out Arrangements [Member] |  |  |  |
Acquisition consideration: |  |  |  |
Fair value of contingent consideration (earn-out liability) |  | $ 33,612 |  |
Pacer [Member] | Canadian Dollars [Member] |  |  |  |
Acquisition consideration: |  |  |  |
Cash | $ 126,500 |  |  |
Total consideration transferred | 150,800 |  |  |
Identifiable assets acquired and liabilities assumed: |  |  |  |
Current assets, including $3.4 million of cash acquired | 114,000 |  |  |
Business combinations, cash acquired | 3,400 |  |  |
Property and equipment | 81,200 |  |  |
Finite-lived intangible assets | 19,400 |  |  |
Current liabilities, including current portion of capital lease obligations and long-term debt | (71,800) |  |  |
Long-term debt, including capital lease obligations | (69,600) |  |  |
Deferred income taxes | (30,500) |  |  |
Total identifiable net assets | 50,400 |  |  |
Goodwill | 100,400 |  |  |
Total net assets acquired, including goodwill | 150,800 |  |  |
Pacer [Member] | Canadian Dollars [Member] | Equity Method Investments [Member] |  |  |  |
Identifiable assets acquired and liabilities assumed: |  |  |  |
Net equity method investment obligations | (31,000) |  |  |
Pacer [Member] | Canadian Dollars [Member] | Pre-Qualifications [Member] |  |  |  |
Identifiable assets acquired and liabilities assumed: |  |  |  |
Pre-qualifications | 38,700 |  |  |
Pacer [Member] | Canadian Dollars [Member] | Earn-Out Arrangements [Member] |  |  |  |
Acquisition consideration: |  |  |  |
Fair value of contingent consideration (earn-out liability) | $ 24,300 |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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