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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