Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Other than Temporary Impairment Losses, Investments	$ 0	$ 460,000	$ 500,000
Cost Method Investment, Ownership Percentage			6.25%
Investments in Affiliates	14,212,000		14,305,000
Payments for (Proceeds from) Investments	822,000	0	1,300,000
Due to Affiliate, Current	1,200,000
Cost Method Investment, Ownership Percentage, Other	10.00%
Investment in IPXI [Member]
Investments in Affiliates	$ 2,500,000		$ 2,500,000