Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
On what date was the attendance greater than 18,118 when Colorado was the visitor?

### Inputs:
table_name: table, columns: ['Date', 'Visitor', 'Score', 'Home', 'Decision', 'Attendance', 'Record']

### Response:
SELECT Date FROM table WHERE Attendance > 18,118 AND Visitor = colorado