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Acquisitions (Schedule of assets acquired and liabilities assumed) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Feb. 02, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Tax-deductible goodwill | $ 671,190 | $ 669,036 |
J-Mac Tool, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Current assets, net of cash acquired |  |  | $ 36,174
Property and equipment |  |  | 11,506
Intangible assets (primarily customer relationships) |  |  | 10,400
Tax-deductible goodwill |  |  | 13,977
Current liabilities |  |  | (10,129)
Long-term liabilities |  |  | (22)
Net assets acquired |  |  | $ 61,906

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- Definition Amount of intangible assets, excluding goodwill, acquired 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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