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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounting Standards Update 2016-02 |
Summary of impacts of adoption of recent accounting pronouncements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Balance at | ​ | ​ | ​ | ​ | ​ | Balance at | ​
​ | ​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | January 1, | ​
​ | ​ | ​ | 2018 | ​ | ​ | Adjustments | ​ | ​ | 2019 | ​
Consolidated Balance Sheets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease right-of-use assets | ​ | $ | — | ​ | $ | 83,222 | ​ | $ | 83,222 | ​
Prepaid and other | ​ | ​ | 118,245 | ​ | ​ | (1,383) | ​ | ​ | 116,862 | ​
Property, plant and equipment | ​ | ​ | 991,613 | ​ | ​ | 5,876 | ​ | ​ | 997,489 | ​
Current maturities of long-term obligations, net of unamortized debt issuance costs | ​ | ​ | 62,678 | ​ | ​ | 2,631 | ​ | ​ | 65,309 | ​
Accounts payable and accrued liabilities | ​ | ​ | 525,199 | ​ | ​ | 20,508 | ​ | ​ | 545,707 | ​
Operating lease liabilities | ​ | ​ | — | ​ | ​ | 61,331 | ​ | ​ | 61,331 | ​
Long-term obligations, net of unamortized debt issuance costs | ​ | ​ | 1,125,993 | ​ | ​ | 3,245 | ​ | ​ | 1,129,238 | ​

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