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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity in Corporation's Active Stock Plans
A combined summary of activity in our active stock-based compensation plans is presented in the following table.
 
 
 
 
 
Non-Vested Stock
Awards/Stock Units
Outstanding
 
Stock Options
Outstanding
 
Shares
Available
for Grant
 
Director
Deferred
Stock Units
Outstanding
 
Number
of Shares
 
Weighted-
Average
Grant-Date
Fair Value
 
Number
of Shares
 
Weighted-
Average
Exercise
Price
Balance, January 1, 2015
1,973,427

 
38,867

 
175,490

 
$
60.55

 
5,029,882

 
$
58.99

Authorized
—

 
—

 
—

 
—

 
—

 
—

Granted
—

 
—

 
—

 
—

 
—

 
—

Stock options exercised
—

 
—

 
—

 
—

 
(14,350
)
 
50.74

Stock awards vested
—

 
—

 
—

 
—

 
—

 
—

Forfeited
5,191

 
—

 
—

 
—

 
(5,191
)
 
65.97

Canceled/expired
—

 
—

 
—

 
—

 
(193
)
 
71.39

Balance, March 31, 2015
1,978,618

 
38,867

 
175,490

 
$
60.55

 
5,010,148

 
$
59.00
Shares Issued in Connection with Stock Compensation Awards
Shares issued in connection with stock compensation awards along with other related information were as follows:
 
Three Months Ended 
 March 31,
 
2015
 
2014
New shares issued from available authorized shares
—

 
—

Issued from available treasury stock
14,350

 
329,825

Total
14,350

 
329,825

 
 
 
 
Proceeds from stock option exercises
$
728

 
$
17,279
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Stock-based compensation expense was as follows:
 
Three Months Ended 
 March 31,
 
2015
 
2014
Stock options
$
2,166

 
$
1,770

Non-vested stock awards/stock units
396

 
366

Deferred stock units
—

 
—

Total
$
2,562

 
$
2,136
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense at March 31, 2015 was as follows:
Stock options
$
19,832

Non-vested stock awards/stock units
2,042

Total
$
21,874