Borrowings (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

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

Borrowings consist of the following:

	September 30, 2012			December 31, 2011
4.875% 10-year notes due October 15, 2015	$	299,392		$	299,244
5.45% 10-year notes due March 15, 2018	348,185			347,938
4.30% 10-year notes due March 1, 2021	449,780			449,761
6.60% 30-year notes due March 15, 2038	247,749			247,683
5.375% 30-year notes due March 1, 2041	345,471			345,352
6.65% 30-year debentures due June 1, 2028	199,440			199,414
5.375% 30-year debentures due October 15, 2035	296,327			296,208
Other	8,952			1,652
Total long-term debt	2,195,296			2,187,252
Less current installments	(3,134		)	(1,022		)
	$	2,192,162		$	2,186,230

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

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Interest expense	$	31,103		$	31,700		$	94,226		$	93,816
Interest income	(715		)	(1,639		)	(4,094		)	(7,280		)
Interest expense, net	$	30,388		$	30,061		$	90,132		$	86,536