Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation Stock Options Activity [Table Text Block]

The following table presents stock options outstanding during 2013, 2012 and 2011 under these plans (in thousands, except for per share data):

	Number		Weighted- Average Exercise Price	Aggregate Intrinsic Value
Options outstanding at December 31, 2010	3,135,334		$45.62	$	24,405
Options awarded	185,007		55.94
Options exercised	(576,518	)	44.35
Options forfeited	(60,005	)	47.93
Options expired	(62,471	)	54.13
Options outstanding at December 31, 2011	2,621,347		$47.01	$	20,769
Options awarded	67,155		58.76
Options exercised	(708,295	)	45.32
Options forfeited	(22,559	)	50.36
Options expired	(66,862	)	45.97
Options outstanding at December 31, 2012	1,890,786		$48.29	$	11,748
Options awarded	81,492		55.74
Options exercised	(608,663	)	48.00
Options forfeited	(219,342	)	47.65
Options expired	(9,168	)	50.61
Options outstanding at December 31, 2013	1,135,105		$49.09	$	19,564
Options vested at:
December 31, 2011	825,682		$46.72	$	6,779
December 31, 2012	601,367		47.99	3,890
December 31, 2013	424,459		49.49	7,146

Outstanding and Vested Stock Options [Table Text Block]

The following table summarizes information concerning currently outstanding and vested stock options:

Options Outstanding				Options Vested
		Weighted				Weighted
		Average	Weighted		Weighted	Average
Range of		Remaining	Average		Average	Remaining
Exercise	Number	Contractual	Exercise	Number	Exercise	Contractual
Prices	Outstanding	Life (years)	Price	Vested	Price	Life (years)
$37.74	1,267	0.02	$37.74	1,267	$37.74	0.02
45.15 - 47.34	84,725	1.42	47.12	84,725	47.12	1.42
54.33	134,485	2.11	54.33	74,447	54.33	1.37
48.46	233,739	2.88	48.46	80,747	48.46	1.66
55.94	214,483	2.99	55.94	102,311	55.94	0.74
36.65	253,607	3.44	36.65	61,449	36.65	1.64
48.30	47,581	3.84	48.30	11,007	48.30	1.51
58.76	83,726	5.18	58.76	8,506	58.76	2.03
55.74	81,492	6.03	55.74	—	—	0

Assumptions used in the determination of fair value of stock options awarded [Table Text Block]

The fair value of options was determined as of the date of grant using a Black-Scholes option pricing model with the following weighted average assumptions:

	2013			2012			2011
Average risk-free interest rate1	0.89		%	0.93		%	1.87		%
Dividend yield	2.80		%	2.20		%	1.80		%
Volatility factors	0.272			0.280			0.268
Weighted average expected life	4.9 years			4.9 years			4.9 years
Weighted average fair value	$	9.67		$	11.48		$	11.92

¹  Average risk-free interest rate represents U.S. Treasury rates matched to the expected life of the options.

Schedule of Nonvested Share Activity [Table Text Block]

The following represents a summary of the non-vested stock awards as of December 31, 2013 (in thousands):

	Shares		Weighted Average Grant Date Fair Value
Non-vested at January 1, 2013	592,831
Granted	211,791		$55.84
Lapsed	(66,648	)	35.93
Forfeited	(89,985	)	49.95
Non-vested at December 31, 2013	647,989