Revenue (Narrative) (Details)	12 Months Ended
Dec. 31, 2020
Payment term of obligation	30 days
Maximum [Member]
Performance obligation satisfaction period	30 days

Typical period of satisfaction of a performance obligation.

No definition available.

Name:	cik0000886835_PerformanceObligationSatisfactionPeriod
Namespace Prefix:	cik0000886835_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration