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 2036. Future minimum lease payments, including payments during expected renewal option periods, at December 31, 2014 were as follows (in thousands):



Year Ended December 31,	Capital Leases		Operating Leases
2015	$	2,613	$	53,007
2016	2,146		51,687
2017	1,901		50,260
2018	1,594		47,978
2019	1,388		46,880
Thereafter	11,361		356,337
Total minimum rentals	21,003		$	606,149
Less amounts representing interest at rates ranging from 2.7% to 11.8%	5,797
Capital lease obligations	$	15,206

At December 31, 2014, buildings and equipment with a cost of approximately $19.2 million and accumulated depreciation of approximately $4.7 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, 2014, 2013 and 2012 was approximately $66.1 million, $52.6 million and $47.3 million, respectively.