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Change in Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Trade receivables $ 479,638 $ 521,938
Other current assets 56,893 70,847
Other non-current assets 451,401 271,818
Total Assets 5,086,983 4,683,066
Deferred income taxes 58,965 56,277
Total Liabilities 3,959,878 3,599,848
Retained earnings 969,406 922,662
Total Liabilities and Stockholders' Equity 5,086,983 4,683,066
Trade receivables    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Trade receivables 50,705 $ 45,895
Balances without the adoption of Topic 606    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other current assets 55,058  
Other non-current assets 455,190  
Total Assets 5,085,306  
Deferred income taxes 58,366  
Total Liabilities 3,959,279  
Retained earnings 968,328  
Total Liabilities and Stockholders' Equity 5,085,306  
Balances without the adoption of Topic 606 | Trade receivables    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Trade receivables 47,074  
Accounting Standards Update 2014-09 | Adjustments    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other current assets (1,835)  
Other non-current assets 3,789  
Total Assets (1,677)  
Deferred income taxes (599)  
Total Liabilities (599)  
Retained earnings (1,078)  
Total Liabilities and Stockholders' Equity (1,677)  
Accounting Standards Update 2014-09 | Adjustments | Trade receivables    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Trade receivables $ (3,631)