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Interest Expense | 3 Months Ended
--- | ---
Mar. 31, 2021
Interest Expense |
Interest Expense | 13.Interest Expense The following is a summary of interest expense: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2021 |  | 2020
​ |  | (In thousands)
Interest expense before capitalized interest | ​ | $ | 16,666 | ​ | $ | 16,554
Amortization of deferred financing costs | ​ |  | 1,047 | ​ |  | 622
Interest expense related to finance lease right-of-use assets | ​ | ​ | 426 | ​ | ​ | 144
Net unrealized gain on derivative financial instruments not designated as cash flow hedges | ​ |  | (133) | ​ |  | (47)
Capitalized interest | ​ |  | (1,710) | ​ |  | (5,268)
Interest expense | ​ | $ | 16,296 | ​ | $ | 12,005
​

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- Definition The entire disclosure for interest income and interest expense for enterprises that derive a significant portion of their revenue from interest collected on investments, loans, and securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-12) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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