Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Expense
Interest expense before capitalized interest	$ 17,278	$ 18,274	$ 50,744	$ 52,751
Amortization of deferred financing costs	1,096	857	3,188	2,255
Interest expense related to finance lease right-of-use assets	430	464	1,284	1,026
Net unrealized (gain) loss on derivative financial instruments not designated as cash flow hedges	37	202	(50)	173
Capitalized interest	(1,598)	(2,912)	(4,854)	(11,545)
Interest expense	$ 17,243	$ 16,885	$ 50,312	$ 44,660

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of interest expense on finance lease liability.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Amount of cash paid for interest capitalized, classified as investing activity.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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