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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
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
515,000

 
—

 
—

 
—

 
—

 
—

Granted
(6,576
)
 
6,576

 
—

 
—

 
—

 
—

Stock options exercised
—

 
—

 
—

 
—

 
(171,474
)
 
52.20

Stock awards vested
—

 
—

 
—

 
—

 
—

 
—

Forfeited
18,482

 
—

 
—

 
—

 
(18,482
)
 
66.10

Canceled
(9,309
)
 
—

 
—

 
—

 
—

 
—

Expired
—

 
—

 
—

 
$
—

 
(774
)
 
$
71.39

Balance, June 30, 2015
2,491,024

 
45,443

 
175,490

 
$
60.55

 
4,839,152

 
$
59.20


Shares issued in connection with stock compensation awards are issued from available treasury shares. If no treasury shares are available, new shares are issued from available authorized shares. Shares issued in connection with stock compensation awards along with other related information were as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
New shares issued from available authorized shares
—

 
—

 
—

 
—

Issued from available treasury stock
157,124

 
54,950

 
171,474

 
384,775

Total
157,124

 
54,950

 
171,474

 
384,775

 
 
 
 
 
 
 
 
Proceeds from stock option exercises
$
8,222

 
$
2,830

 
$
8,950

 
$
20,109


Stock-based compensation expense is recognized ratably over the requisite service period for all awards. The service period generally matches the vesting period for most awards; however, the service period for certain executive officers does not extend past the date they reach 65 years of age. Stock-based compensation expense was as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Stock options
$
2,028

 
$
1,754

 
$
4,194

 
$
3,524

Non-vested stock awards/stock units
267

 
366

 
663

 
732

Deferred stock units
480

 
440

 
480

 
440

Total
$
2,775

 
$
2,560

 
$
5,337

 
$
4,696


Unrecognized stock-based compensation expense at June 30, 2015 was as follows:
Stock options
$
17,629

Non-vested stock awards/stock units
1,774

Total
$
19,403