Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Future Minimum Lease Payments

The schedule of future minimum lease payments under all operating leases is as follows:

Year
2013	$	6,309
2014		3,970
2015		3,282
2016		2,840
2017		1,673
2018 or later		2,234
Total	$	20,308

Installment Payments for Purchased Rights and Ownership of Intellectual Property

As discussed in Note 2, W.E.T. purchased the rights and ownership of certain intellectual property from Johnson Controls for $7,000. W.E.T. is required to make nine quarterly installment payments to Johnson Controls beginning September 30, 2012. W.E.T. expects to make the following payments to Johnson Controls over the next two years:

Year
2013	$	1,627
2014		1,298
Total	$	2,925