Financial Instruments and Fair Values - Effect of Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	$ 11,935	$ 10,057	$ 6,533	$ 19,819
Amount of loss reclassified from accumulated other comprehensive income (loss) into interest expense	1,882	(2,741)	3,154	(6,036)
Interest expense	(25,405)	(25,042)	(50,709)	(50,056)
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	11,935	10,057	6,533	19,819
Amount of loss reclassified from accumulated other comprehensive income (loss) into interest expense	1,882	(2,741)	3,154	(6,036)
Interest rate swap | Reclassification out of accumulated other comprehensive income | Accumulated other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 1,882	$ (2,741)	$ 3,154	$ (6,036)