Accounts Receivable Grants from Outside Parties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
GRANTS FROM OUTSIDE PARTIES: [Abstract]
Grant proceeds received from outside parties	$ 4,800	$ 16,200
Amortization of deferred grants	$ 3,245	$ 2,949