5. Employee benefits expense

(in thousands of euros)	2018	2017
Short-term employee benefits	174,067	166,137
Post-retirement benefits	27,814	25,157
Other long-term employee benefits	2,417	3,668
Termination and unemployment benefits	9,957	2,285
Other staff costs	14,786	15,281
Total employee benefits	229,041	212,528

(in thousands of euros)	2018	2017
Salaries	178,380	167,061
Social charges	17,978	15,881
Internal hours capitalised	-22,291	-16,805
Total short-term employee benefits	174,067	166,137

Pension charges (defined contribution plans)	26,886	23,614
Early retirement benefits	928	1,543
Total post-retirement benefits	27,814	25,157

Jubilee benefits	-93	915
Long-term management bonuses	98	397
Other employee benefits	2,412	2,356
Total other long-term employee benefits	2,417	3,668

The average number of employees at Royal Schiphol Group N.V. and its subsidiaries on a full-time equivalent basis was 2,324 (2017: 2,180).

Termination and unemployment benefits in 2018 includes an amount of 8.3 million euros of costs Schiphol Group expects to incur in respect of restructurings in a few of its departments. The restructurings were announced in 2018 and implementation is ongoing or will commence in 2019.

The internal hours capitalised relate to time spent by employees in the development phases of investment projects. Other staff costs include training costs and travel expenses. The costs of post-retirement benefits, other long-term employee benefits and termination and unemployment benefits are explained in more detail in note 24. Employee benefits. For an explanation of the remuneration of Supervisory and Management Board members under Section 2:383c of the Dutch Civil Code, reference is made to the section entitled Related party disclosures.

5. Employee benefits expense

6. Depreciation, amortisation and impairment expenses

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