Leases

The Company has non-cancelable operating leases, primarily for land, tower space, office-space, certain office equipment and vehicles. The operating leases generally contain renewal options for periods ranging from one to ten years and require the Company to pay all executory costs such as maintenance and insurance. Rental expense for operating leases was approximately $27.4 million, $22.6 million, and $25.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Future minimum payments under non-cancelable operating leases (with initial or remaining lease terms in excess of one year), future minimum sublease income to be received and a lease commitment under a sale leaseback agreement as of December 31, 2014 are as follows (in thousands):



Year Ending December 31:	Future Minimum Rent Under Operating Leases		Future Minimum Sublease Income			Future Minimum Commitments Under Sale Leaseback Agreement		Net Commitments
2015	$	26,282	$	(1,710	)	$	1,040	$	25,612
2016	23,380		(269		)	1,076		24,187
2017	20,296		—			1,114		21,410
2018	15,643		—			1,153		16,796
2019	12,648		—			1,193		13,841
Thereafter	32,272		—			—		32,272
	$	130,521	$	(1,979	)	$	5,576	$	134,118