Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Cash Flow Information [Abstract]
Cash paid for state income taxes	$ 185,000	$ 211,000	$ 169,000
Current Foreign Tax Expense (Benefit)	7,586,000	268,000	3,000
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction		210,000
Debt issuance costs, charged to additional paid in capital		117,000
Debt issuance costs, charged to noncontrolling interests in operating subsidiaries		$ 93,000