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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
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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 |  |

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