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Comprehensive Income
9 Months Ended
Sep. 30, 2011
Notes to Condensed Consolidated Financial Statements [Abstract] 
Comprehensive Income
Comprehensive Income
 
Comprehensive income for the three months ended September 30, 2011 and 2010 was $31,360 and $22,863, respectively.  Comprehensive income for the nine months ended September 30, 2011 and 2010 was $73,579 and $40,315, respectively. Comprehensive income is comprised of net income, foreign currency translation adjustments related to the Company’s operations outside of the US, changes in the fair value of the Company’s interest rate swap agreement, and the amortization of gains and losses related to the Company’s pension and postretirement benefits liabilities.