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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2016
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.
|  |  | Director Deferred Stock Units Outstanding |  | Non-Vested Stock Awards/Stock Units Outstanding |  | Stock Options Outstanding
| Shares Available for Grant |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Exercise Price
Balance, January 1, 2016 | 1,589,727 |  |  | 45,443 |  |  | $ | 61.16 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,612,240 |  |  | $ | 60.30 |
Authorized | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted | (8,216 | ) |  | 8,216 |  |  | 63.25 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock options exercised | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (67,075 | ) |  | 53.46 |
Stock awards/units vested | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited/expired | 39,192 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (39,192 | ) |  | 70.84 |
Balance, June 30, 2016 | 1,620,703 |  |  | 53,659 |  |  | $ | 61.48 |  |  | 173,180 |  |  | $ | 66.05 |  |  | 5,505,973 |  |  | $ | 60.31 |
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
New shares issued from available authorized shares | — |  |  | — |  |  | — |  |  | — |
Issued from available treasury stock | 65,200 |  |  | 157,124 |  |  | 67,075 |  |  | 171,474 |
Total | 65,200 |  |  | 157,124 |  |  | 67,075 |  |  | 171,474 |
Proceeds from stock option exercises | $ | 3,490 |  |  | $ | 8,222 |  |  | $ | 3,586 |  |  | $ | 8,950 |
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock options | $ | 2,117 |  |  | $ | 2,028 |  |  | $ | 4,242 |  |  | $ | 4,194 |
Non-vested stock awards/stock units | 358 |  |  | 267 |  |  | 715 |  |  | 663 |
Deferred stock units | 520 |  |  | 480 |  |  | 520 |  |  | 480 |
Total | $ | 2,995 |  |  | $ | 2,775 |  |  | $ | 5,477 |  |  | $ | 5,337 |
Unrecognized stock-based compensation expense at June 30, 2016 was as follows:
Stock options | $ | 16,517 |
Non-vested stock awards/stock units | 2,640 |
Total | $ | 19,157 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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