Grants from Outside Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
GRANTS FROM OUTSIDE PARTIES: [Abstract]
Grant proceeds received from outside parties	$ 39,632,000	$ 22,642,000	$ 40,802,000
Grant amortization offset to depreciation expense	$ 8,000,000	$ 7,900,000	$ 10,600,000