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Long-term Equity-based Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The assumptions used in the Black-Scholes pricing model for Tandem Awards granted during the six months ended June 30, 2014 and 2013 were as follows:
 
Six Months Ended
 
Jun 30, 2014
 
Jun 30, 2013
Range of Valuation Assumptions
 
 
 
 
 
 
 
Expected Volatility
25.76
%
-
44.43
%
 
39.10
%
-
48.23
%
Risk-free Interest Rate
1.07

-
2.14

 
0.62

-
1.38

Expected Dividend Yield
2.53

-
2.60

 
2.83

-
3.00

Weighted-Average Expected Life in Years
 

 
 
 
 

 
 
Employee Grants
4

-
7
 
4

-
7
Director Grants
6
 
6
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
Tandem Award activity for the six months ended June 30, 2014 is presented below.
 
Shares Subject
to Award
 
Weighted-
Average
Exercise Price
Per Share ($)
 
Weighted-
Average
Remaining
Contractual Life
(in Years)
 
Aggregate
Intrinsic Value
($ in Millions)
Outstanding at Beginning of the Year
2,543,673

 
$
41.37

 
 
 
 
Granted
284,000

 
36.59

 
 
 
 
Exercised
(26,375
)
 
28.76

 
 
 
 
Forfeited or Expired
(464,123
)
 
47.88

 
 
 
 
Outstanding at June 30, 2014
2,337,175

 
$
39.65

 
4.49
 
$
5.0

Vested and Expected to Vest at June 30, 2014
2,299,770

 
$
39.77

 
4.43
 
$
4.8

Exercisable at June 30, 2014
1,773,360

 
$
41.57

 
3.16
 
$
3.2

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Information pertaining to Tandem Awards outstanding at June 30, 2014 is presented below.
 
 
 
 
Outstanding
 
Exercisable
Range of Exercise Prices
 
Shares
Subject to Award
 
Weighted-
Average
Exercise Price
Per Share ($)
 
Weighted-
Average
Remaining
Contractual
Life (in Years)
 
Shares
Subject to Tandem
Award
 
Weighted-
Average
Exercise Price
Per Share ($)
$
10.00

-
$
15.00

 
16,750

 
$
13.55

 
4.60
 
16,750

 
$
13.55

15.01

-
20.00

 
8,000

 
16.48

 
4.85
 
8,000

 
16.48

20.01

-
25.00

 
30,750

 
23.38

 
5.57
 
30,750

 
23.38

25.01

-
30.00

 
390,250

 
28.86

 
7.08
 
237,062

 
28.75

30.01

-
35.00

 
246,250

 
33.18

 
8.62
 
87,623

 
32.69

35.01

-
40.00

 
587,500

 
36.90

 
6.51
 
335,500

 
37.23

40.01

-
45.00

 
194,902

 
43.10

 
0.59
 
194,902

 
43.10

45.01

-
50.00

 
806,005

 
48.59

 
1.67
 
806,005

 
48.59

50.01

-
55.00

 
56,768

 
51.16

 
0.60
 
56,768

 
51.16

10.00

-
55.00

 
2,337,175

 
39.65

 
4.49
 
1,773,360

 
41.57

Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan, Activity [Table Text Block]
Activity related to DSU awards for the six months ended June 30, 2014 was as follows:
 
Number of DSUs
 
Weighted-
Average
Grant-Date
Fair Value
Per DSU
Vested Balance at Beginning of the Year
4,000

 
$
31.50

Granted and Vested
4,000

 
37.53

Vested Balance at End of Period
8,000

 
34.52

Time Vested Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Activity related to nonvested time-based restricted stock and nonvested time-based RSUs for the six months ended June 30, 2014 was as follows:
 
Time-based Restricted
Stock Awards
 
Time-based RSU Awards
 
Number of Shares
 
Weighted-
Average
Grant-Date
Fair Value
Per Share
 
Number of RSUs
 
Weighted-
Average
Grant-Date
Fair Value
Per RSU
Nonvested Balance at Beginning of the Year
101,627

 
$
31.48

 

 
$

Granted
2,000

 
38.59

 
41,425

 
36.58

Vested

 

 

 

Forfeited
(15,576
)
 
31.00

 
(1,200
)
 
36.47

Nonvested Balance at End of Period
88,051

 
31.72

 
40,225

 
36.58

Performance Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Activity related to nonvested performance-based restricted stock and nonvested performance-based RSUs for the six months ended June 30, 2014 was as follows:
 
Performance-based Restricted Stock Awards
 
Performance-based RSU Awards
 
Number of Shares
 
Weighted-
Average
Grant-Date
Fair Value
Per Share
 
Number of RSUs
 
Weighted-
Average
Grant-Date
Fair Value
Per RSU
Nonvested Balance at Beginning of the Year
176,800

 
$
39.54

 

 
$

Granted

 

 
66,575

 
40.50

Vested
(54,934
)
 
39.83

 

 

Forfeited
(3,991
)
 
40.73

 
(300
)
 
40.50

Nonvested Balance at End of Period
117,875

 
39.37

 
66,275

 
40.50