Leases

The Company has entered into various building and equipment capital and operating leases in operation and under development and for office space, expiring at various dates through 2037. Future minimum lease payments, including payments during expected renewal option periods, at December 31, 2015 were as follows (in thousands):



Year Ended December 31,	Capital Leases		Operating Leases
2016	$	3,021	$	55,636
2017	2,776		55,857
2018	2,502		53,515
2019	2,068		52,034
2020	1,866		50,378
Thereafter	12,991		331,746
Total minimum rentals	25,224		$	599,166
Less amounts representing interest at rates ranging from 1.7% to 13.4%	6,611
Capital lease obligations	$	18,613

At December 31, 2015, buildings and equipment with a cost of approximately $23.4 million and accumulated depreciation of approximately $5.6 million were held under capital leases. The Company and the partners in the partnerships have guaranteed payment of certain of these leases. Rental expense for operating leases for the years ended December 31, 2015, 2014 and 2013 was approximately $74.6 million, $66.1 million and $52.6 million, respectively.