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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2015
Dec. 31, 2014
May 01, 2014
Business Acquisition [Line Items]          
Non-tax-deductible goodwill $ 652,743 $ 669,036   $ 798,481  
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     $ 61,900    
Quality Wireline and Cable, Inc.          
Business Acquisition [Line Items]          
Current assets, net of cash acquired         $ 7,596
Property and equipment         3,837
Intangible assets (primarily customer relationships)         11,527
Non-tax-deductible goodwill         20,573
Current liabilities         (1,615)
Deferred tax liabilities         (3,629)
Net assets acquired         $ 38,289