If you specify just a bare ID, then the initial application works but
subsequent applications may end up doing bad things, like:
```
-/+ aws_ebs_volume.vol_1
availability_zone: "us-east-1a" => "us-east-1a"
encrypted: "true" => "true"
iops: "" => "<computed>"
kms_key_id: "arn:aws:kms:us-east-1:123456789:key/59faf88b-0912-4cca-8b6c-bd107a6ba8c4" => "59faf88b-0912-4cca-8b6c-bd107a6ba8c4" (forces new resource)
size: "100" => "100"
snapshot_id: "" => "<computed>"
```
Paul Stack