
8.	Leases

We lease premises and certain equipment under cancelable and non-cancelable leases, some of which contain renewal options under various terms. Total rental expense for continuing operations associated with these operating leases was $1.7 million in 2017 and $1.5 million in 2016. During the fourth quarter of 2006, we entered into a 15-year lease in Atlanta, Georgia for 335,372 square feet (net of space which was surrendered to the landlord through our exercise of a termination option), 255,110 square feet of which we have subleased, and the remainder of which houses our corporate offices. In connection with this lease, we received a $21.2 million construction allowance for the build-out of our new corporate offices. We are amortizing the construction allowance as a reduction of rent expense over the term of the lease. As of December 31, 2017, the future minimum rental commitments (in thousands) for all non-cancelable operating leases with initial or remaining terms of more than one year (both gross and net of any sublease income) are as follows:



	Gross		Sublease Income			Net
2018	$	9,865	$	(6,741	)	$	3,124
2019	9,783		(6,930		)	2,853
2020	9,808		(7,126		)	2,682
2021	9,832		(7,327		)	2,505
2022	4,157		(3,117		)	1,040
Thereafter	—		—			—
Total	$	43,445	$	(31,241	)	$	12,204

In addition, we occasionally lease certain equipment under cancelable and non-cancelable leases, which are accounted for as capital leases in our consolidated financial statements. As of December 31, 2017, we had no material non-cancelable capital leases with initial or remaining terms of more than one year.