This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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+ Details

Investments Narrative (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
Investments Narrative (Details) (USD $)	Oct. 31, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Oct. 30, 2009
Schedule of Investments [Line Items]
Percentage of ownership held by Existing Holder							60.00%
Percentage of ownership held by Company or equity interest		30.00%		30.00%		30.00%	30.00%
Percentage of ownership held by Joint Venturer							10.00%
Equity in earnings of unconsolidated affiliate		$ 3,034,000	$ 2,174,000	$ 6,641,000	$ 4,883,000
Interest income recognized		200,000	200,000	600,000	800,000
Lease Cancellation Amount	$ 4,000,000
One Year from Balance Sheet Date [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options		60.00%		60.00%
More than Two and within Three Years from Balance Sheet Date [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options		66.00%		66.00%
More than Three and within Four Years from Balance Sheet Date [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options		80.00%		80.00%