Borrowings (Tables)

12 Months Ended

Dec. 31, 2012

Short-term Debt [Line Items]

Schedule of Short-term Debt [Table Text Block]

Borrowings consist of the following:

	December 31, 2012		December 31, 2011
Short-term
Current portion of long-term debt	$	3,266	$	1,022
Commercial paper	607,500		—
	$	610,766	$	1,022

Borrowings [Table Text Block]

	December 31, 2012			December 31, 2011
Long-term
4.875% 10-year notes due October 15, 2015	$	299,441		$	299,244
5.45% 10-year notes due March 15, 2018	348,268			347,938
4.30% 10-year notes due March 1, 2021	449,787			449,761
6.60% 30-year notes due March 15, 2038	247,771			247,683
5.375% 30-year notes due March 1, 2041	345,511			345,352
6.65% 30-year debentures due June 1, 2028	199,448			199,414
5.375% 30-year debentures due October 15, 2035	296,367			296,208
Other	6,023			1,652
Total long-term debt	2,192,616			2,187,252
Less current portion	(3,266		)	(1,022		)
	$	2,189,350		$	2,186,230

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

Interest expense and interest income for the years ended December 31, 2012, 2011 and 2010 were as follows:

	Years Ended December 31,
	2012			2011			2010
Interest expense	$	125,995		$	124,783		$	115,324
Interest income	(4,854		)	(9,258		)	(8,953		)
Interest expense, net	$	121,141		$	115,525		$	106,371

Scheduled maturities [Table Text Block]

Scheduled maturities of long-term debt for the years ending December 31 are as follows:

2013	$	3,266
2014	2,645
2015	299,441
2016	—
2017	—
2018 and thereafter	1,887,264