Borrowings (Tables)

6 Months Ended

Jun. 30, 2012

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Borrowings consist of the following:

	June 30, 2012			December 31, 2011
4.875% 10-year notes due October 15, 2015	$	299,342		$	299,244
5.45% 10-year notes due March 15, 2018	348,103			347,938
4.30% 10-year notes due March 1, 2021	449,774			449,761
6.60% 30-year notes due March 15, 2038	247,727			247,683
5.375% 30-year notes due March 1, 2041	345,432			345,352
6.65% 30-year debentures due June 1, 2028	199,431			199,414
5.375% 30-year debentures due October 15, 2035	296,287			296,208
Other	9,056			1,652
Total long-term debt	2,195,152			2,187,252
Less current installments	(3,402		)	(1,022		)
	$	2,191,750		$	2,186,230

Schedule of Interest expense and interest income [Table Text Block]

Interest expense and interest income for the three and six months ended June 30, 2012 and 2011 were as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Interest expense	$	31,478		$	31,080		$	63,123		$	62,116
Interest income	(1,761		)	(2,923		)	(3,379		)	(5,641		)
Interest expense, net	$	29,717		$	28,157		$	59,744		$	56,475