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Stock-based Compensation | 3 Months Ended
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Mar. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation | 2. Stock-based Compensation The Company uses share-based payments to compensate employees and non-employee directors. The Company recognizes the cost of share-based payments under the fair-value-based method. Share-based awards consist of equity instruments in the form of stock options, restricted stock or restricted stock units and have included service and, in certain cases, performance conditions. The Company’s share-based awards also included share-settled performance unit awards. Share-settled performance unit awards are accounted for as equity awards. The Company issues shares of common stock when vested stock options are exercised, when restricted stock is granted and when restricted stock units and share-settled performance unit awards vest. Stock Options — The Company estimates the grant date fair values of stock options using the Black-Scholes-Merton valuation model. Volatility assumptions are based on the historic volatility of the Company’s common stock over the most recent period equal to the expected term of the options as of the date the options are granted. The expected term assumptions are based on the Company’s experience with respect to employee stock option activity. Dividend yield assumptions are based on the expected dividends at the time the options are granted. The risk-free interest rate assumptions are determined by reference to United States Treasury yields. Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three month periods ended March 31, 2016 and 2015 follow:
| Three Months Ended |
| March 31, |
| 2016 |  |  | 2015 |
Volatility |  | 39.52 | % |  |  | 38.47 | %
Expected term (in years) |  | 5.00 |  |  |  | 5.00 |
Dividend yield |  | 2.65 | % |  |  | 2.41 | %
Risk-free interest rate |  | 1.76 | % |  |  | 1.65 | %
Stock option activity from January 1, 2016 to March 31, 2016 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise |
| Shares |  |  | Price |
Outstanding at January 1, 2016 |  | 6,307,250 |  |  | $ | 21.68 |
Granted |  | 50,000 |  |  | $ | 15.08 |
Exercised |  | — |  |  |  | — |
Cancelled |  | — |  |  |  | — |
Expired |  | (30,000 | ) |  | $ | 34.24 |
Outstanding at March 31, 2016 |  | 6,327,250 |  |  | $ | 21.56 |
Exercisable at March 31, 2016 |  | 5,332,768 |  |  | $ | 21.46 |
Restricted Stock — For all restricted stock awards to date, shares of common stock were issued when the awards were made. Non-vested shares are subject to forfeiture for failure to fulfill service conditions and, in certain cases, performance conditions. Non-forfeitable dividends are paid on non-vested shares of restricted stock. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period. Restricted stock activity from January 1, 2016 to March 31, 2016 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock outstanding at January 1, 2016 |  | 1,432,250 |  |  | $ | 24.56 |
Granted |  | 15,000 |  |  | $ | 15.08 |
Vested |  | (60,831 | ) |  | $ | 24.60 |
Forfeited |  | (14,939 | ) |  | $ | 25.24 |
Non-vested restricted stock outstanding March 31, 2016 |  | 1,371,480 |  |  | $ | 24.45 |
Restricted Stock Units — For all restricted stock unit awards made to date, shares of common stock are not issued until the units vest. Restricted stock units are subject to forfeiture for failure to fulfill service conditions. Non-forfeitable cash dividend equivalents are paid on certain non-vested restricted stock units. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period. Restricted stock unit activity from January 1, 2016 to March 31, 2016 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock units outstanding at January 1, 2016 |  | 41,686 |  |  | $ | 26.22 |
Granted |  | — |  |  | $ | — |
Vested |  | — |  |  | $ | — |
Forfeited |  | — |  |  | $ | — |
Non-vested restricted stock units outstanding March 31, 2016 |  | 41,686 |  |  | $ | 26.22 |
Performance Unit Awards. The Company has granted stock-settled performance unit awards to certain executive officers (the “Stock-Settled Performance Units”) on an annual basis since 2010. The Stock-Settled Performance Units provide for the recipients to receive a grant of shares of stock upon the achievement during a specified period of certain performance goals established by the Compensation Committee. The performance period for the Stock-Settled Performance Units is the three year period commencing on April 1 of the year of grant, except that for the Stock-Settled Performance Units granted in 2013 the performance period has been extended pursuant to its terms, as described below. The performance goals for the Stock-Settled Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee. These goals are considered to be market conditions under the relevant accounting standards and the market conditions were factored into the determination of the fair value of the respective performance units. Generally, the recipients will receive a target number of shares if the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 50th percentile. If the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 75th percentile or higher, then the recipients will receive two times the target number of shares. If the Company’s total shareholder return during the performance period is positive, and, when compared to the peer group, is at the 25th percentile, then the recipients will only receive one-half of the target number of shares. If the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, achievement is between the 25th and 75th percentile, then the shares to be received by the recipients will be determined on a pro-rata basis. For the Stock-Settled Performance Units awarded prior to 2016, there is no payout unless the Company’s total shareholder return is positive and, when compared to the peer group, is at or above the 25th percentile. In respect of the 2013 Stock-Settled Performance Units, the performance period ended March 31, 2016, the Company’s total shareholder return for the performance period was negative, the Company’s total shareholder return for the performance period when compared to the peer group was above the 75th percentile, and there was no payout; provided, however, that pursuant to the terms of those 2013 awards, if, during the two-year period ending March 31, 2018, the Company’s total shareholder return for any 30 consecutive day period equals or exceeds 18 percent on an annualized basis from April 1, 2013 through the last day of such 30 consecutive day period, and the recipient is actively employed by the Company through the last day of the extended performance period, then the Company will issue to the recipient the number of shares equal to the amount the recipient would have been entitled to receive if the Company’s total shareholder return had been positive during the initial three year performance period. For the Stock-Settled Performance Units granted in April 2016, if the Company’s total shareholder return is negative, and, when compared to the peer group is at or above the 25th percentile, then the recipients will receive one-half of the number of shares they would have received if the Company’s total shareholder return had been positive. The total target number of shares with respect to the Stock-Settled Performance Units for the awards in 2012-2015 is set forth below:
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 190,600 |  |  |  | 154,000 |  |  |  | 236,500 |  |  |  | 192,000 |
Because the performance units are stock-settled awards, they are accounted for as equity awards and measured at fair value on the date of grant using a Monte Carlo simulation model. The fair value of the Stock-Settled Performance Units is set forth below (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 4,052 |  |  | $ | 5,388 |  |  | $ | 5,564 |  |  | $ | 3,065 |
These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended March 31, 2016 | $ | 338 |  |  | $ | 449 |  |  | $ | 464 |  |  | NA |
Three months ended March 31, 2015 | NA |  |  | $ | 449 |  |  | $ | 464 |  |  | $ | 255 |

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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=6418621&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=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 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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