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Commitments and contingencies (Tables) | 12 Months Ended
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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 |

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