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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) |

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