Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Comprehensive Income (Loss) [Abstract]
Net income	$ 1,508,495	$ 9,122,747	$ 3,508,046	$ 16,799,324
Adjustments for changes in:
Foreign exchange translation	(1,148,330)	20,556	593,930	1,453,387
Unrealized holding (losses) gains on marketable securities	(69,260)	6,118	40,590	109,205
Fair value of cash flow hedges	(228,910)	(130,503)	(3,399)	(261,272)
Reclassification adjustments for items included in net income:
Amortization of unrecognized employee benefit costs	1,250,681	1,005,238	2,516,877	1,836,733
Realized (gains) from sale of marketable securities	(6,533)	(15,526)	(27,430)	(22,039)
Realized (gains) losses from settlement of cash flow hedges	(28,138)	(191,310)	94,467	(621,329)
Other comprehensive (loss) income	(230,490)	694,573	3,215,035	2,494,685
Comprehensive income	$ 1,278,005	$ 9,817,320	$ 6,723,081	$ 19,294,009

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