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Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Performance obligation satisfied in previous period $ 0 $ 11,600,000 $ 0 $ 18,100,000
Change in estimate of transaction price 0 0 0 0
Change in total estimated costs, measure of progress 0 0 0 0
Loss on contracts 0 $ 0 0 $ 0
Change in net contract liabilities     50,100,000  
Contract asset impairment     0  
Remaining performance obligations $ 3,673,131,000   3,673,131,000  
Cumulative effect on retained earnings, net of tax [1]     854,000  
2018 Acquisitions        
Business Acquisition [Line Items]        
Increase (decrease) in contract assets from acquisitions     300,000  
Increase (decrease) in contract liabilities from acquisitions     $ 2,100,000  
[1] Represents adjustment to retained earnings upon the adoption of Accounting Standards Codification Topic 606.