Grants from Outside Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
GRANTS FROM OUTSIDE PARTIES: [Abstract]
Grant proceeds received from outside parties	$ 22,642,000	$ 40,802,000	$ 24,575,000
Grant amortization offset to depreciation expense	$ 7,900,000	$ 10,600,000	$ 4,300,000