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Stock Plans | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Plans | Stock Plans Under various stock plans, officers, employees, and outside directors have received or may receive grants of restricted stock, stock units, stock appreciation rights or options to purchase common stock. Grants have been made at the discretion of the Committees of the Board of Directors. Grants generally vest either on a straight-line basis over four years or on a cliff basis over three years. Shares offered under the plan are authorized but unissued shares or treasury shares. Options currently outstanding under the plans have an exercise price equal to the fair market value of the Company’s common stock at the date of grant and consist of non-statutory stock options under the Internal Revenue Code, and generally have a term of 10 years. The Company has not granted any options to purchase common stock since 2006. Recipients of restricted stock do not pay any cash consideration to the Company for the shares, have the right to vote all shares subject to such grant, and for grants made prior to July 28, 2009, receive all dividends with respect to such shares on the dividend payment dates, whether or not the shares have vested as long as any performance condition has been met. Restricted stock grants made on or after July 28, 2009, contain forfeitable rights to dividends. Dividends for these grants are accrued on the dividend payment dates but are not paid until the shares vest, and dividends accrued for shares that ultimately do not vest are forfeited. Recipients of stock units do not pay any cash consideration for the units, do not have the right to vote, and do not receive dividends with respect to such units. FASB authoritative guidance requires that excess tax benefits be recognized as an addition to capital surplus and that unrealized tax benefits be recognized as income tax expense unless there are excess tax benefits from previous equity awards to which it can be offset. The Company calculates the amount of eligible excess tax benefits that are available to offset future tax shortfalls in accordance with the long-form method described in the FASB authoritative guidance. The Company recognizes compensation expense equal to the grant-date fair value for all stock-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire award, unless the awards are subject to performance conditions, in which case the Company recognizes compensation expense over the requisite service period of each separate vesting tranche. The Company determines the grant-date fair value of its restricted stock and stock unit awards using the fair market value on the grant date, unless the awards are subject to market conditions, in which case the Company utilizes a binomial-lattice model (i.e., Monte Carlo simulation model). The Monte Carlo simulation model utilizes multiple input variables to determine the stock-based compensation expense. During the year ended December 31, 2014, the Company granted performance shares to its executives in the form of restricted stock. The shares granted contain (1) a performance condition based on target net income per share, and (2) a market condition based on Total Shareholder Return (“TSR”). The TSR market condition measures the Company’s performance against a peer group. Shares will be delivered at the end of the three year vesting and TSR performance period based on the Company’s actual performance compared to the peer group. Actual shares earned will range from fifty percent (50%) to one hundred fifty percent (150%) of the target award after any adjustment made for the performance condition. The fair value of this award was determined using a Monte Carlo simulation with the following assumptions: an historical volatility of 31.55%, 0% dividend yield and a risk-free interest rate of 0.79%. The historical volatility was based on the most recent 2.75-year period for the Company and the components of the peer group. The stock price projection for the Company and the components of the peer group assumes a 0% dividend yield. This is mathematically equivalent to reinvesting dividends in the issuing entity over the performance period. The risk-free interest rate is equal to the yield, as of the measurement date, of the zero-coupon U.S. Treasury bill that is commensurate with the remaining performance measurement period. Stock-based compensation expense consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
Restricted stock and stock units |  | $ | 40,821 |  |  | $ | 38,867 |  |  | $ | 41,464 |
Unrecognized compensation cost is expected to be recognized over the next four years. Total unrecognized compensation cost, net of estimated forfeitures, consisted of the following (in thousands):
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Restricted stock and stock units |  | $ | 54,968 |  |  | $ | 53,646 |  |  | $ | 51,877 |
The following table reflects activity under all stock plans from December 31, 2011 through December 31, 2014, and the weighted average exercise prices (in thousands, except per share amounts):
|  | Restricted Stock Plans without Market-Condition |  | Restricted Stock Plans with Market-Condition |  | Stock Option Plans
|  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/ Units |  | Weighted Average Exercise Price Per Share
Outstanding, December 31, 2011 |  |  | 2,392 |  |  |  | $24.47 |  |  | 523 |  |  |  | $33.42 |  |  | 4,450 |  |  |  | $21.85
Granted |  |  | 937 |  |  |  | $27.71 |  |  | 517 |  |  |  | $29.53 |  |  | — |  |  |  | —
Exercised |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  |  | (2,260 | ) |  |  | $19.00
Restrictions lapsed |  |  | (1,550 | ) |  |  | $22.20 |  |  | (240 | ) |  |  | $33.42 |  |  | — |  |  |  | —
Forfeited |  |  | (42 | ) |  |  | $24.26 |  |  | (42 | ) |  |  | $33.42 |  |  | (99 | ) |  |  | $24.74
Outstanding, December 31, 2012 |  |  | 1,737 |  |  |  | $28.25 |  |  | 758 |  |  |  | $30.77 |  |  | 2,091 |  |  |  | $24.80
Granted |  |  | 688 |  |  |  | $35.34 |  |  | 400 |  |  |  | $42.04 |  |  | — |  |  |  | —
Exercised |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  |  | (1,397 | ) |  |  | $23.82
Restrictions lapsed |  |  | (1,087 | ) |  |  | $28.53 |  |  | (259 | ) |  |  | $29.53 |  |  | — |  |  |  | —
Forfeited |  |  | (21 | ) |  |  | $31.29 |  |  | — |  |  |  | — |  |  | (62 | ) |  |  | $20.48
Outstanding, December 31, 2013 |  |  | 1,317 |  |  |  | $31.68 |  |  | 899 |  |  |  | $36.58 |  |  | 632 |  |  |  | $27.41
Granted |  |  | 585 |  |  |  | $41.60 |  |  | 335 |  |  |  | $50.09 |  |  | — |  |  |  | —
Exercised |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  |  | (528 | ) |  |  | $27.12
Restrictions lapsed |  |  | (712 | ) |  |  | $31.96 |  |  | — |  |  |  | — |  |  | — |  |  |  | —
Forfeited |  |  | (25 | ) |  |  | $32.82 |  |  | — |  |  |  | — |  |  | (27 | ) |  |  | $27.83
Outstanding, December 31, 2014 |  |  | 1,165 |  |  |  | $36.47 |  |  | 1,234 |  |  |  | $40.24 |  |  | 77 |  |  |  | $29.22
The total pre-tax intrinsic value of stock options exercised and the total fair value of shares vested during the years ended December 31, 2014, 2013 and 2012, are reflected in the following table (in thousands):
|  | Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
Total pre-tax intrinsic value of stock options exercised |  | $ | 9,150 |  |  | $ | 17,092 |  |  | $ | 23,678 |
Total fair value of shares vested |  | $ | 38,566 |  |  | $ | 53,931 |  |  | $ | 55,186 |
The following table summarizes information about options outstanding and exercisable as of December 31, 2014 (in thousands, except number of years and per share amounts):
|  | Options Outstanding and Exercisable
Range of Exercise Prices |  | Number Outstanding and Exercisable as of December 31, 2014 |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
$25.34 to $25.34 |  |  | 30 |  |  |  | 0.34 |  | $25.34 |  |  | $ | 991 |  |
$30.34 to $30.34 |  |  | 21 |  |  |  | 0.08 |  | $30.34 |  |  | 601 |  |
$32.36 to $32.36 |  |  | 18 |  |  |  | 1.58 |  | $32.36 |  |  | 477 |  |
$33.89 to $33.89 |  |  | 8 |  |  |  | 0.58 |  | $33.89 |  |  | 184 |  |
|  |  | 77 |  |  |  | 0.59 |  | $29.22 |  |  | $ | 2,253 |  |
The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value, based on the Company’s closing stock price of $58.38 as of December 31, 2014, which would have been received by the option holders had they exercised their in-the-money options as of that date. At December 31, 2014, the total number of available shares to grant under the plans (consisting of either restricted stock, stock units, stock appreciation rights or options to purchase common stock) was approximately 6.5 million. All of the 77 thousand options outstanding at December 31, 2014, were exercisable with a weighted average exercise price of $29.22.

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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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: 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=6418621&loc=d3e17540-113929 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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