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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table presents stock options outstanding during 2014, 2013 and 2012 under these plans (in thousands, except for per share data):
 
 
Number
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
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 awarded
 
—

 
—

 
 
Options exercised
 
(323,004
)
 
49.17

 
 
Options forfeited
 
(15,509
)
 
45.71

 
 
Options expired
 
(2,701
)
 
47.98

 
 
Options outstanding at December 31, 2014
 
793,891

 
$
49.05

 
$
8,725

Options vested at:
 
 
 
 
 
 
December 31, 2012
 
601,367

 
$
47.99

 
$
3,890

December 31, 2013
 
424,459

 
49.49
 
7,146

December 31, 2014
 
347,633

 
48.85
 
3,889
Schedule of Share-based Compensation, 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)
$36.65
 
190,832

 
2.83
 
$36.65
 
65,626

 
$36.65
 
1.51
45.15 - 47.34
 
33,574

 
0.76
 
47.09
 
33,574

 
47.09
 
0.76
48.30
 
39,557

 
3.16
 
48.30
 
13,326

 
48.30
 
1.42
48.46
 
169,422

 
2.16
 
48.46
 
95,415

 
48.46
 
1.49
54.33
 
78,904

 
1.48
 
54.33
 
78,904

 
54.33
 
1.48
55.74
 
78,108

 
5.16
 
55.74
 
8,260

 
55.74
 
2.03
55.94
 
125,285

 
3.62
 
55.94
 
37,008

 
55.94
 
1.44
58.76
 
78,209

 
4.35
 
58.76
 
15,520

 
58.76
 
1.59
Schedule of Share-based Compensation, Stock Options, Valuation Assumptions [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
Average risk-free interest rate1
 
0.89
%
 
0.93
%
Dividend yield
 
2.80
%
 
2.20
%
Volatility factors
 
0.272

 
0.280

Weighted average expected life
 
4.9 years

 
4.9 years

Weighted average fair value
 
$
9.67

 
$
11.48

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, 2014 (in thousands):
 
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Non-vested at January 1, 2012
 
503,738

 
 
   Granted
 
197,058

 
$55.63
   Vested
 
(76,192
)
 
$47.32
   Forfeited
 
(31,773
)
 
$50.45
Non-vested at December 31, 2012
 
592,831

 
 
   Granted
 
211,791

 
$55.84
   Vested
 
(66,648
)
 
$35.93
   Forfeited
 
(89,985
)
 
$49.95
Non-vested at December 31, 2013
 
647,989

 
 
   Granted
 
206,621

 
$64.96
   Vested
 
(140,820
)
 
$44.56
   Forfeited
 
(25,179
)
 
$56.26
Non-vested at December 31, 2014
 
688,611