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Equity Compensation Plans | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At June 30, 2015 and December 31, 2014, 1,987,975 and 2,225,245 shares of common stock, respectively, were available for grant under our Incentive Plan. The unamortized compensation cost of awards issued under the Incentive Plan and purchases under the Employee Stock Purchase Plan totaled $22 million at June 30, 2015, as shown in the following table.
|  | Six Months Ended June 30, 2015
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 1,091 |  |  | $ | 12,304 |  |  | $ | 6,874 |  |  | $ | — |  |  | $ | 20,269 |
Equity grants |  | 2,709 |  |  | 5,923 |  |  | — |  |  | 236 |  |  | 8,868 |
Equity grant forfeitures |  | (387 | ) |  | — |  |  | — |  |  | — |  |  | (387 | )
Equity compensation expense |  | (521 | ) |  | (3,931 | ) |  | (1,709 | ) |  | (116 | ) |  | (6,277 | )
Unrecognized Compensation Cost at End of Period |  | $ | 2,892 |  |  | $ | 14,296 |  |  | $ | 5,165 |  |  | $ | 120 |  |  | $ | 22,473 |
At June 30, 2015, the weighted average amortization period remaining for all of our equity awards was less than two years. Restricted Stock At June 30, 2015 and December 31, 2014, there were 187,669 and 109,464 shares, respectively, of restricted stock awards outstanding. Restrictions on these shares lapse through 2019. During the six months ended June 30, 2015, there were 139,526 restricted stock awards granted, 40,643 restricted stock awards that vested and were distributed, and 20,678 restricted stock awards forfeited. Deferred Stock Units (“DSUs”) At June 30, 2015 and December 31, 2014, there were 2,169,028 and 2,168,824 DSUs, respectively, outstanding of which 1,235,082 and 1,287,862, respectively, had vested. There were 314,527 DSUs granted, and 314,323 DSUs distributed, and no DSUs forfeited during the six months ended June 30, 2015. Unvested DSUs at June 30, 2015 vest through 2019. Performance Stock Units (“PSUs”) At both June 30, 2015 and December 31, 2014, the target number of PSUs that were unvested was 761,051. PSUs do not vest until the third anniversary of their grant date, with the level of vesting at that time contingent on total stockholder return (defined as the change in our common stock price plus dividends paid on our common stock relative to the per share price of our common stock on the date of the PSU grant) over the three-year vesting period (“Three-Year TSR”). The number of underlying shares of our common stock that will vest during 2015 and in future years will vary between 0% (if Three-Year TSR is negative) and 200% (if Three-Year TSR is greater than or equal to 125%) of the target number of PSUs originally granted, adjusted upward (if vesting is greater than 0%) to reflect the value of dividends paid during the three-year vesting period. With respect to the PSUs granted in 2011, the three-year performance period ended during the fourth quarter of 2014, resulting in the vesting of 701,440 shares of our underlying common stock. The distribution of these underlying shares of common stock occurred in May 2015, in accordance with the terms of the PSUs and our Executive Deferred Compensation Plan. Employee Stock Purchase Plan The ESPP allows a maximum of 450,000 shares of common stock to be purchased in aggregate for all employees. As of June 30, 2015 and December 31, 2014, 292,145 and 274,318 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at June 30, 2015.

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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=6406099&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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