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Summary of Significant Accounting Policies - Prepaid Expenses and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |
Minimum percentage of current assets and liabilities required to be disclosed separately | 5.00% | 5.00%
Interest | $ 83,854 | $ 71,176
Payroll and vacation | 65,846 | 67,379
Incentive compensation | 75,256 | 72,006
Sales tax and VAT payable | 96,564 | 63,725
Dividend | 181,986 | 172,102
Other | 249,178 | 206,758
Accrued expenses | $ 752,684 | $ 653,146

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