Credit Agreements Notes Payable Subordinated and Convertible Debentures Payable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Credit Agreements, Notes Payable, Subordinated and Convertible Debentures Payable
Notes payable - $1,176,000 bearing interest at prime plus 2%, the remainder non-interest bearing, all past dues	$ 1,198	$ 1,198
Subordinated convertible debentures payable:
At 6% interest; due May 1992	8,025	8,025
Subordinated convertible debentures payable	8,025	8,025
Total	$ 9,223	$ 9,223

The portion of the carrying value of convertible subordinated debt as of the balance sheet date that is scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_ConvertibleSubordinatedDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant