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Summary of Significant Accounting Policies - Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Accounts receivable, net $ 970,083 $ 1,124,652 $ 1,506,145    
Prepaid expenses and other current assets 239,747 295,665 352,711    
Total current assets 2,347,200 3,100,242 3,030,159    
Other noncurrent assets 847,006 945,951 950,655    
Total Assets 5,238,225 6,228,147 6,199,684    
Accrued liabilities 704,369 792,139 576,233    
Income taxes payable 13,520 9,498 32,296    
Total current liabilities 1,260,030 1,623,803 2,304,666    
Retained earnings 1,616,595 2,169,002 2,343,878 $ 3,535,746 $ 3,741,316
Total stockholders’ equity 656,803 1,247,099 1,323,329 2,398,169 2,628,755
Total Liabilities and Stockholders’ Equity 5,238,225 6,228,147 6,199,684    
As Previously Reported          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Accounts receivable, net   1,128,610 1,506,145    
Prepaid expenses and other current assets 244,987 303,053 352,711    
Total current assets 2,352,440 3,111,588 3,030,159    
Other noncurrent assets   944,961 950,655    
Total Assets 5,243,465 6,238,503 6,199,684    
Accrued liabilities 700,421   568,845    
Income taxes payable 10,046   32,296    
Total current liabilities 1,252,608   2,297,278    
Retained earnings 1,629,257 2,179,358 2,460,224 3,545,359 3,745,815
Total stockholders’ equity 669,465 1,257,455 1,439,675 2,407,782 2,633,254
Total Liabilities and Stockholders’ Equity 5,243,465 6,238,503 6,199,684    
Adjustments          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Accounts receivable, net   (3,958) 0    
Prepaid expenses and other current assets (5,240) (7,388) 0    
Total current assets (5,240) (11,346) 0    
Other noncurrent assets   990 0    
Total Assets (5,240) (10,356) 0    
Accrued liabilities 3,948   7,388    
Income taxes payable 3,474   0    
Total current liabilities 7,422   7,388    
Retained earnings (12,662) (10,356) (116,346) (9,613) (4,499)
Total stockholders’ equity (12,662) (10,356) (116,346) $ (9,613) $ (4,499)
Total Liabilities and Stockholders’ Equity $ (5,240) $ (10,356) $ 0