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Change in Accounting Policies (Schedule of New Accounting Pronouncements and Changes in Accounting Principles) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 483,995 | $ 521,938
Other current assets | 46,231 | 70,847
Other non-current assets | 560,714 | 271,818
Total Assets | 5,164,162 | 4,683,066
Accrued liabilities | 254,984 | 251,717
Deferred income taxes | 58,583 | 56,277
Total Liabilities | 4,003,294 | 3,599,848
Retained earnings | 1,022,888 | 922,662
Total Liabilities and Stockholders' Equity | 5,164,162 | 4,683,066
Trade receivables |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 51,403 | $ 45,895
Balances without the adoption of Topic 606 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other current assets | 44,994 |
Other non-current assets | 564,367 |
Total Assets | 5,162,947 |
Accrued liabilities | 255,192 |
Deferred income taxes | 57,984 |
Total Liabilities | 4,002,903 |
Retained earnings | 1,022,064 |
Total Liabilities and Stockholders' Equity | 5,162,947 |
Balances without the adoption of Topic 606 | Trade receivables |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 480,364 |
Accounting Standards Update 2014-09 | Adjustments |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other current assets | (1,237) |
Other non-current assets | 3,653 |
Total Assets | (1,215) |
Accrued liabilities | 208 |
Deferred income taxes | (599) |
Total Liabilities | (391) |
Retained earnings | (824) |
Total Liabilities and Stockholders' Equity | (1,215) |
Accounting Standards Update 2014-09 | Adjustments | Trade receivables |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ (3,631) |

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