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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Commitments and Contingencies | Note 14 – Commitments and Contingencies In the ordinary course of business, we may be subject to various legal proceedings and claims, including employment disputes, patent claims, disputes over contract agreements and other commercial disputes. In some cases, claimants seek damages or other relief, such as royalty payments related to patents, which, if granted, could require significant expenditures. Although the outcome of any claim or litigation can never be certain, it is our opinion that the outcome of all contingencies of which we are currently aware will not materially affect our business, operations, financial condition or cash flows. We have committed to invest up to an aggregate of $7.9 million in two private equity funds, and we have contributed $8.4 million as of December 31, 2017, of which $7.7 million has been applied to these commitments. We lease office space and equipment under operating leases which expire at various dates through 2025. As of December 31, 2017, future minimum rental payments under non-cancelable operating leases with original maturities of greater than 12 months are as follows:
(In thousands) |  |  |  |
2018 |  | $ | 3,073 |
2019 |  |  | 927 |
2020 |  |  | 805 |
2021 |  |  | 793 |
Thereafter |  |  | 2,907 |
Total |  | $ | 8,505 |
Rental expense was $4.5 million, $4.2 million and $4.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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