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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock options outstanding and exercisable under long-term performance compensation plan
A reconciliation of the number of SOSARs outstanding and exercisable under the Long-Term Performance Compensation Plan as of December 31, 2014, and changes during the period then ended is as follows:
 


Shares
(000's)
 

Weighted- Average Exercise
Price
 
Weighted- Average Remaining Contractual Term
 
Aggregate Intrinsic Value
(000's)
SOSARs outstanding at January 1, 2014
173

 
$
15.99

 
 
 
 
SOSARs exercised
(121
)
 
13.49

 
 
 
 
SOSARs cancelled / forfeited
—

 
—

 
 
 
 
SOSARs outstanding at December 31, 2014
52

 
$
21.83

 
0.16
 
$
1,615

Vested and expected to vest at December 31, 2014
52

 
$
21.83

 
0.16
 
$
1,615

SOSARs exercisable at December 31, 2014
52

 
$
21.83

 
0.16
 
$
1,615

 
Year ended December 31,
(in thousands)
2014
 
2013
 
2012
Total intrinsic value of SOSARs exercised
$
5,193

 
$
4,678

 
$
1,937

Total fair value of shares vested
$
—

 
$
576

 
$
818

Weighted average fair value of options granted
$
—

 
$
—

 
$
—
Summary of nonvested restricted shares
A summary of the status of the Company's nonvested restricted shares as of December 31, 2014, and changes during the period then ended, is presented below:
 
Shares (000)'s
 
Weighted-Average Grant-Date Fair Value
Nonvested restricted shares at January 1, 2014
188

 
$
35.74

Granted
59

 
54.84

Vested
(67
)
 
33.99

Forfeited
(5
)
 
42.34

Nonvested restricted shares at December 31, 2014
175

 
$
42.69

 
Year ended December 31,
 
2014
 
2013
 
2012
Total fair value of shares vested (000's)
$1,585
 
$1,121
 
$590
Weighted average fair value of restricted shares granted
$54.84
 
$47.65
 
$28.99
Summary of nonvested performance share units
A summary of the status of the Company's PSUs as of December 31, 2014, and changes during the period then ended, is presented below:
 
Shares (000)'s
 
Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2014
350

 
$
35.27

Granted
96

 
54.84

Vested
(110
)
 
31.87

Forfeited
(7
)
 
45.14

Nonvested at December 31, 2014
329

 
$
41.92

 
Year ended December 31,
 
2014
 
2013
 
2012
Weighted average fair value of PSUs granted
$54.84
 
$47.32
 
$28.99
Fair value of the option component of the ESP Plan
 
2014
 
2013
 
2012
Risk free interest rate
0.13
%
 
0.16
%
 
0.11
%
Dividend yield
0.74
%
 
1.49
%
 
1.37
%
Volatility factor of the expected market price of the common shares
0.23

 
0.27

 
0.41

Expected life for the options (in years)
1.00

 
1.00

 
1.00