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Business Combinations - Summary of the Preliminary Estimated Fair Values of the Assets Acquired and the Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 27, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets:        
Goodwill $ 2,399,118   $ 2,160,290 $ 2,159,337
Bluegrass Materials Company        
Assets:        
Cash and cash equivalents   $ 1,159    
Receivables   25,479    
Inventory   46,635    
Other current assets   1,029    
Property, plant and equipment   1,519,289    
Intangible assets, other than goodwill   20,150    
Goodwill   244,615    
Total Assets   1,858,356    
Liabilities:        
Accounts payable and accrued expenses   17,978    
Deferred income tax liabilities, net   214,020    
Noncontrolling interest   9,001    
Total Liabilities   240,999    
Total Consideration   $ 1,617,357