Accounts Receivable Grants from Outside Parties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
GRANTS FROM OUTSIDE PARTIES: [Abstract]
Grant proceeds received from outside parties	$ 16,200	$ 16,400
Amortization of deferred grants	$ 2,949	$ 2,799