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Commitments | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Commitments | (6) Commitments As of December 31, 2017, Forrester had future contractual obligations as follows for operating leases (in thousands):
2018 | $ | 12,506 |
2019 |  | 11,442 |
2020 |  | 10,835 |
2021 |  | 9,409 |
2022 |  | 8,001 |
Thereafter |  | 29,490 |
Total minimum lease payments | $ | 81,683 |
The cost of these operating leases, including any contractual rent increases, rent concessions, and landlord incentives, are recognized ratably over the life of the related lease agreement. Aggregate rent expense was $17.4 million, $16.1 million and $16.0 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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