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Lease Commitments | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Lease Commitments | Note 10. Lease Commitments Operating Leases We lease certain of our office facilities and equipment under various operating leases. Future minimum cash commitments under operating leases as of December 31, 2017 were as follows (in thousands):
Year Ending December 31, |  | Gross Operating Lease Commitments |  |  | Sub-Leases |  |  | Net Operating Lease Commitments |
2018 |  | $ | 35,239 |  |  | $ | 283 |  |  | $ | 34,956 |
2019 |  |  | 31,459 |  |  |  | 234 |  |  |  | 31,225 |
2020 |  |  | 26,793 |  |  |  | 234 |  |  |  | 26,559 |
2021 |  |  | 21,451 |  |  |  | - |  |  |  | 21,451 |
2022 |  |  | 18,979 |  |  |  | — |  |  |  | 18,979 |
Thereafter |  |  | 70,244 |  |  |  | — |  |  |  | 70,244 |
Total |  | $ | 204,165 |  |  | $ | 751 |  |  | $ | 203,414 |
Rent expense for continuing operations incurred under operating leases was $38.4 million, $37 million and $35.7 million for the years ended December 31, 2017, 2016 and 2015, respectively. Rent expense does not necessarily reflect cash payments, as described under “Operating Leases” in Note 1.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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