Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest Expense
Interest expense before capitalized interest	$ 68,485	$ 70,561	$ 78,313
Amortization of deferred financing costs	4,291	3,315	3,217
Interest expense related to finance lease right-of-use assets	2,261	1,450	921
Net unrealized (gain) loss on derivative financial instruments not designated as accounting hedges	(342)	184	50
Capitalized interest	(6,734)	(13,189)	(29,806)
Interest expense	$ 67,961	$ 62,321	$ 52,695