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Accounting Pronouncements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Property and equipment, net $ 9,712,267     $ 10,061,948
Financing activities in Consolidated Statement of Cash Flows (330,645) $ (436,678)    
Operating activities in Consolidated Statement of Cash Flows 299,080 960,368    
Accounting Standards Update 2016-02 [Member] | Assets Held under Capital Leases [Member] | Minimum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Property and equipment, net 20,000      
Accounting Standards Update 2016-02 [Member] | Assets Held under Capital Leases [Member] | Maximum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Property and equipment, net $ 40,000      
Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Financing activities in Consolidated Statement of Cash Flows   (5,500)    
Operating activities in Consolidated Statement of Cash Flows   5,500    
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Financing activities in Consolidated Statement of Cash Flows   3,200    
Operating activities in Consolidated Statement of Cash Flows   $ (3,200)    
Accounting Standards Update 2016-16 [Member] | Retained Earnings [Member] | Forecast [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of new accounting principle in period of adoption     $ (152,200)  
Accounting Standards Update 2016-16 [Member] | Other Assets [Member] | Forecast [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of new accounting principle in period of adoption     $ (152,200)