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Detail of Certain Balance Sheet Accounts - Other Assets, net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Offsetting [Abstract] |  |
Receivable related to terminated telecommunications project in Peru | $ 119,648 | $ 119,648
Long-term retainage receivable, net | 88,234 | 54,235
Investments in unconsolidated affiliates | 84,367 | 89,568
Investments held related to deferred compensation plan | 55,855 | 45,273
Long-term insurance receivables | 35,164 | 34,785
Deferred tax assets | 17,685 | 12,545
Long-term accounts receivable, net | 13,367 | 12,427
Deferred financing costs related to senior credit facility, net | 9,695 | 6,695
Other non-current assets | 11,698 | 18,088
Other assets, net | $ 435,713 | $ 393,264

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