The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References+ Details

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 19

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 6

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 9

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.12)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Investments Narrative (Details) (USD $)	3 Months Ended
Investments Narrative (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2009
Schedule of Investments [Line Items]
Percentage of ownership held by Company or equity interest	30.00%		30.00%
Equity in earnings of unconsolidated affiliate	$ 1,988,000	$ 1,518,000
J Devices [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Percentage Of Ownership Held By Majority Owners				60.00%
Percentage of ownership held by Company or equity interest	30.00%			30.00%
Percentage of ownership held by Joint Venturer				10.00%
Equity in earnings of unconsolidated affiliate	(2,000,000)	(1,500,000)
Interest income recognized	100,000	200,000
Lease receivable, net	$ 16,400,000		$ 20,200,000
J Devices [Member] \| One Year from Balance Sheet Date [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options	60.00%
J Devices [Member] \| 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%
J Devices [Member] \| 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%