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Acquisitions Purchase Price Allocation of TelCom Construction, Inc Acquisition (Details) - USD ($)
$ in Thousands
Apr. 23, 2016
Aug. 07, 2015
Jul. 25, 2015
Business Acquisition [Line Items]      
Goodwill $ 281,448   $ 271,653
TelCom Construction, Inc.      
Business Acquisition [Line Items]      
Accounts receivable   $ 11,500  
Costs and estimated earnings in excess of billings   11,800  
Inventories and other current assets   6,100  
Property and equipment   10,800  
Goodwill   9,700  
Total assets   67,900  
Accounts payable   10,000  
Accrued and other liabilities   9,100  
Total liabilities   19,100  
Net Assets Acquired   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   $ 1,800