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Significant Non-Cash Investing Activities
6 Months Ended
Jun. 30, 2019
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]  
Significant Non-Cash Investing and Financing Activities SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:As of June 30, 2019 and 2018, the Company had outstanding accounts receivable from outside parties for the funding of capital expenditures of $18.7 million and $10.9 million, respectively. As of June 30, 2019 and 2018, the Company also had $22.3 million and $9.2 million, respectively, of purchases of property and equipment that were not paid and, accordingly, were accrued in accounts payable in the normal course of business. See Note 5, Leases, for ROU assets obtained during the reporting period in exchange for lease liabilities.