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Condensed Consolidating Financial Information - Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |  |
Cash and cash equivalents |  | $ 593,284 | $ 336,997 | $ 196,567 | $ 264,093
Short-term investments |  | 43,262 | 28,369 |  |
Accounts receivable, net |  | 780,247 | 698,477 |  |
Inventory, net |  | 173,063 | 166,307 |  |
Assets held for sale |  | 35,963 | 37,052 |  |
Other current assets |  | 156,652 | 180,134 |  |
Total current assets |  | 1,782,471 | 1,447,336 |  |
Property, plant and equipment, net |  | 5,709,895 | 6,109,565 |  |
Goodwill |  | 172,817 | 173,226 |  |
Deferred income taxes |  | 406,281 | 419,003 |  |
Other long-term assets |  | 228,824 | 252,854 |  |
Total assets (1) | [1] | 8,300,288 | 8,401,984 |  |
Current liabilities: |  |  |  |  |
Less: current portion |  | 243 | 181 |  |
Trade accounts payable |  | 379,028 | 363,416 |  |
Accrued liabilities |  | 492,787 | 533,044 |  |
Income taxes payable |  | 1,724 | 22,835 |  |
Total current liabilities |  | 873,782 | 919,476 |  |
Long-term debt |  | 3,818,613 | 4,027,766 |  |
Other long-term liabilities |  | 290,013 | 301,633 |  |
Deferred income taxes |  | 20,713 | 10,338 |  |
Total liabilities (1) | [1] | 5,003,121 | 5,259,213 |  |
Redeemable noncontrolling interest in subsidiary (Note 3) |  | 208,519 | 203,998 |  |
Shareholders' equity |  | 3,063,034 | 2,911,816 |  |
Noncontrolling interest |  | 25,614 | 26,957 |  |
Total equity |  | 3,088,648 | 2,938,773 | $ 3,072,778 | $ 3,254,795
Total liabilities and equity |  | 8,300,288 | 8,401,984 |  |
Consolidating Adjustments |  |  |  |  |
Current assets: |  |  |  |  |
Short-term investments |  | 54 |  |  |
Total current assets |  | 54 |  |  |
Intercompany receivables |  | (690,387) | (614,694) |  |
Investment in consolidated affiliates |  | (12,334,583) | (12,131,052) |  |
Deferred income taxes |  | (362,463) | (333,349) |  |
Other long-term assets |  | (26,025) | (72,143) |  |
Total assets (1) |  | (13,413,404) | (13,151,238) |  |
Current liabilities: |  |  |  |  |
Long-term debt |  | (26,025) | (72,143) |  |
Deferred income taxes |  | (362,463) | (333,349) |  |
Intercompany payable |  | (690,387) | (614,694) |  |
Total liabilities (1) |  | (1,078,875) | (1,020,186) |  |
Shareholders' equity |  | (12,334,529) | (12,131,052) |  |
Total equity |  | (12,334,529) | (12,131,052) |  |
Total liabilities and equity |  | (13,413,404) | (13,151,238) |  |
Parent Company | Reportable Legal Entities |  |  |  |  |
Current assets: |  |  |  |  |
Cash and cash equivalents |  | 3,182 | 1,091 |  |
Other current assets |  | 50 | 50 |  |
Total current assets |  | 3,232 | 1,141 |  |
Intercompany receivables |  | 107,379 | 133,602 |  |
Investment in consolidated affiliates |  | 2,981,471 | 2,799,320 |  |
Total assets (1) |  | 3,092,082 | 2,934,063 |  |
Current liabilities: |  |  |  |  |
Trade accounts payable |  | 1,006 | 147 |  |
Accrued liabilities |  | 28,042 | 21,100 |  |
Total current liabilities |  | 29,048 | 21,247 |  |
Intercompany payable |  |  | 1,000 |  |
Total liabilities (1) |  | 29,048 | 22,247 |  |
Shareholders' equity |  | 3,063,034 | 2,911,816 |  |
Total equity |  | 3,063,034 | 2,911,816 |  |
Total liabilities and equity |  | $ 3,092,082 | 2,934,063 |  |
Guarantor Subsidiaries |  |  |  |  |
Condensed Consolidating Financial Information |  |  |  |  |
Ownership percentage |  | 100.00% |  |  |
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |
Current assets: |  |  |  |  |
Cash and cash equivalents |  | $ 43 | 44 |  |
Other current assets |  |  | 56 |  |
Total current assets |  | 43 | 100 |  |
Intercompany receivables |  | 583,008 | 481,092 |  |
Investment in consolidated affiliates |  | 5,337,900 | 5,531,799 |  |
Deferred income taxes |  | 362,463 | 333,349 |  |
Other long-term assets |  | 79 | 78 |  |
Total assets (1) |  | 6,283,493 | 6,346,418 |  |
Current liabilities: |  |  |  |  |
Trade accounts payable |  | 175 | 124 |  |
Accrued liabilities |  | 77,098 | 67,760 |  |
Total current liabilities |  | 77,273 | 67,884 |  |
Long-term debt |  | 3,844,638 | 4,099,909 |  |
Other long-term liabilities |  | 16,299 | 16,284 |  |
Total liabilities (1) |  | 3,938,210 | 4,184,077 |  |
Shareholders' equity |  | 2,345,283 | 2,162,341 |  |
Total equity |  | 2,345,283 | 2,162,341 |  |
Total liabilities and equity |  | 6,283,493 | 6,346,418 |  |
Other Subsidiaries (Non-Guarantors) | Reportable Legal Entities |  |  |  |  |
Current assets: |  |  |  |  |
Cash and cash equivalents |  | 590,059 | 335,862 |  |
Short-term investments |  | 43,208 | 28,369 |  |
Accounts receivable, net |  | 780,247 | 698,477 |  |
Inventory, net |  | 173,063 | 166,307 |  |
Assets held for sale |  | 35,963 | 37,052 |  |
Other current assets |  | 156,602 | 180,028 |  |
Total current assets |  | 1,779,142 | 1,446,095 |  |
Property, plant and equipment, net |  | 5,709,895 | 6,109,565 |  |
Goodwill |  | 172,817 | 173,226 |  |
Investment in consolidated affiliates |  | 4,015,212 | 3,799,933 |  |
Deferred income taxes |  | 406,281 | 419,003 |  |
Other long-term assets |  | 254,770 | 324,919 |  |
Total assets (1) |  | 12,338,117 | 12,272,741 |  |
Current liabilities: |  |  |  |  |
Less: current portion |  | 243 | 181 |  |
Trade accounts payable |  | 377,847 | 363,145 |  |
Accrued liabilities |  | 387,647 | 444,184 |  |
Income taxes payable |  | 1,724 | 22,835 |  |
Total current liabilities |  | 767,461 | 830,345 |  |
Other long-term liabilities |  | 273,714 | 285,349 |  |
Deferred income taxes |  | 383,176 | 343,687 |  |
Intercompany payable |  | 690,387 | 613,694 |  |
Total liabilities (1) |  | 2,114,738 | 2,073,075 |  |
Redeemable noncontrolling interest in subsidiary (Note 3) |  | 208,519 | 203,998 |  |
Shareholders' equity |  | 9,989,246 | 9,968,711 |  |
Noncontrolling interest |  | 25,614 | 26,957 |  |
Total equity |  | 10,014,860 | 9,995,668 |  |
Total liabilities and equity |  | $ 12,338,117 | $ 12,272,741 |  |
[1] | The condensed consolidated balance sheet as of June 30, 2018 and December 31, 2017 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.

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