ACCOUNTING POLICIES (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Cash equivalents
Cash equivalents	$ 33,100,000	$ 81,200,000
Restricted cash
Restricted cash	2,044,000	2,036,000
Total
Assets:
Cash equivalents and restricted cash - Money market mutual funds	35,143,000	83,195,000
Trading securities held in a rabbi trust	222,000	302,000
Total assets	35,365,000	83,497,000
Liabilities:
Deferred compensation accrual rabbi trust	215,000	302,000
Total liabilities	215,000	302,000
Level 1
Assets:
Cash equivalents and restricted cash - Money market mutual funds	35,143,000	83,195,000
Trading securities held in a rabbi trust	222,000	302,000
Total assets	35,365,000	83,497,000
Liabilities:
Deferred compensation accrual rabbi trust	215,000	302,000
Total liabilities	$ 215,000	$ 302,000