Table:
|  | 2019 | 2018 |
| --- | --- | --- |
| Restructuring costs | $8,455 | $10,647 |
| Costs of closed restaurants and other | 8,628 | 4,803 |
| (Gains) losses on disposition of property and equipment, net | (6,244) | 1,627 |
| Accelerated depreciation | 1,616 | 1,130 |
| Operating restaurant impairment charges | — | 211 |
|  | $12,455 | $18,418 |
Paragraphs:
The following table presents the components of impairment and other charges, net, in each fiscal year (in thousands):
Restructuring costs decreased by $2.2 million as a result of lower severance expenses, as our general and administrative cost reduction initiative came to its conclusion as planned. Costs of closed restaurants and other increased by $3.8 million, primarily due to a $3.5 million charge recorded in 2019 related to the write- off of software development costs associated with a discontinued technology project. Gains on disposition of property and equipment, net, increased by $7.9 million, primarily due to a $5.7 million gain related to a sale of property and a$0.8 million gain related to an eminent domain transaction in 2019.
Refer to Note 9, Impairment and Other Charges, Net, of the notes to the consolidated financial statements for additional information regarding these charges.
Question:
Why did the restructuring costs decreased from 2018 to 2019?