Fair value measurement (Tables)

3 Months Ended

Mar. 31, 2021

Fair value measurement

Fair Value Assets Recurring and Nonrecurring

		March 31, 2021				December 31, 2020
		Carrying				Carrying
	Category	amount		Fair value		amount		Fair value
Fair values disclosed:
Cash and cash equivalents	Level 1	$	294,380	$	294,380	$	278,766	$	278,766
Restricted cash	Level 1		147,240		147,240		28,129		28,129
Loan receivables	Level 2		5,658		6,238		5,798		6,438
Short-term debt	Level 2		25,933		25,933		29,145		29,145
Long-term debt
Senior unsecured notes	Level 1		493,177		513,450		492,734		514,219
Term loan	Level 2		96,734		97,279		97,812		98,420
Long-term revolver loan	Level 2		46,808		46,882		46,102		46,184