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Acquisitions Purchase Price Allocation of TelCom Construction, Inc Acquisition (Details) - USD ($)
$ in Thousands
Oct. 24, 2015
Aug. 07, 2015
Jul. 25, 2015
Business Acquisition [Line Items]      
Goodwill $ 281,448   $ 271,653
TelCom Construction, Inc.      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   $ 11,500  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other   11,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   5,400  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets   700  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   10,800  
Goodwill   9,700  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   67,900  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   10,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other   9,100  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   19,100  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   48,800  
Customer relationships | TelCom Construction, Inc.      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   16,200  
Trade names | TelCom Construction, Inc.      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   1,600  
Non-compete agreements | TelCom Construction, Inc.      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 200