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Condensed Consolidated Statements Of Comprehensive Income (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 1,999,551 $ 7,676,577
Other comprehensive income (loss), net of tax where applicable:    
Foreign exchange translation 1,742,260 1,432,831
Unrealized holding gains on marketable securities 109,850 103,087
Fair value of cash flow hedges 225,511 (130,769)
Reclassification adjustments for items included in net income:    
Amortization of unrecognized employee benefit costs 1,266,196 831,495
Realized gains on sale of marketable securities (20,897) (6,513)
Realized losses (gains) from settlement of cash flow hedges 122,605 (430,019)
Other comprehensive income 3,445,525 1,800,112
Comprehensive income $ 5,445,076 $ 9,476,689