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Changes in Accounting Policies (Schedule of New Accounting Pronouncements and Changes in Accounting Principles) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 470,689 | $ 521,938
Other current assets | 47,648 | 70,847
Other non-current assets | 487,171 | 271,818
Total Assets | 5,174,569 | 4,683,066
Accrued liabilities | 259,825 | 251,717
Deferred income taxes | 77,684 | 56,277
Total Liabilities | 3,969,427 | 3,599,848
Retained earnings | 1,109,017 | 922,662
Total Liabilities and Stockholders' Equity | 5,174,569 | $ 4,683,066
Balances without the adoption of Topic 606 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 467,058 |
Other current assets | 45,916 |
Other non-current assets | 492,006 |
Total Assets | 5,174,041 |
Accrued liabilities | 260,138 |
Deferred income taxes | 77,085 |
Total Liabilities | 3,969,141 |
Retained earnings | 1,108,775 |
Total Liabilities and Stockholders' Equity | 5,174,041 |
Accounting Standards Update 2014-09 | Adjustments |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | (3,631) |
Other current assets | (1,732) |
Other non-current assets | 4,835 |
Total Assets | (528) |
Accrued liabilities | 313 |
Deferred income taxes | (599) |
Total Liabilities | (286) |
Retained earnings | (242) |
Total Liabilities and Stockholders' Equity | $ (528) |

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