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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts Payable |  |  |
Purchase of property and equipment incurred | $ 5.2 | $ 6.6 | $ 0.4
Accrued Expenses |  |  |
Purchase of property and equipment incurred |  |  | $ 2.7

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