Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of minimum future non-cancelable lease obligations on long-term operating leases

Minimum future non-cancelable lease obligations on long-term operating leases in effect at December 31, 2017 are approximately as follows (in thousands):

2018	$	224,359
2019	191,120
2020	156,494
2021	121,881
2022	91,351
Thereafter	424,640
	$	1,209,845

Related party

Schedule of minimum future non-cancelable lease obligations on long-term operating leases

As of December 31, 2017, future rental commitments under outstanding agreements with related parties are approximately as follows (in thousands):

2018	$	5,667
2019	5,811
2020	5,958
2021	6,086
2022	5,981
Thereafter	4,559
	$	34,062