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Equity Compensation Plans | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At March 31, 2016 and December 31, 2015, 1,391,379 and 1,665,032 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 $20 million at March 31, 2016, as shown in the following table. Table 17.1 – Activities of Equity Compensation Costs by Award Type
|  | Three Months Ended March 31, 2016
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 2,393 |  |  | $ | 14,392 |  |  | $ | 6,823 |  |  | $ | — |  |  | $ | 23,608 |
Equity grants |  | 1,741 |  |  | 3,355 |  |  | — |  |  | 124 |  |  | 5,220 |
Equity grant forfeitures |  | (1,119 | ) |  | (150 | ) |  | (2,209 | ) |  | — |  |  | (3,478 | )
Equity compensation (expense) income |  | 17 |  |  | (4,712 | ) |  | (1,092 | ) |  | (31 | ) |  | (5,818 | )
Unrecognized Compensation Cost at End of Period |  | $ | 3,032 |  |  | $ | 12,885 |  |  | $ | 3,522 |  |  | $ | 93 |  |  | $ | 19,532 |
At March 31, 2016, the weighted average amortization period remaining for all of our equity awards was less than two years. Restricted Stock At March 31, 2016 and December 31, 2015, there were 223,914 and 187,180 shares, respectively, of restricted stock outstanding. Restrictions on these shares lapse through 2020. During the three months ended March 31, 2016, there were 144,056 shares of restricted stock granted, restrictions on 48,061 shares of restricted stock lapsed and those shares were distributed, and 59,261 shares of restricted stock awards forfeited. Deferred Stock Units (“DSUs”) At March 31, 2016 and December 31, 2015, there were 2,680,320 and 2,407,154 DSUs, respectively, outstanding of which 1,707,272 and 1,363,548, respectively, had vested. There were 281,014 DSUs granted, no DSUs distributed, and 7,849 DSUs forfeited during the three months ended March 31, 2016. Unvested DSUs at March 31, 2016 vest through 2020. During the three months ended March 31, 2016, equity compensation expense of $3 million was recognized in connection with the announced departures of two executives due to the full vesting of their DSUs in accordance with the terms of their employment agreements. Performance Stock Units (“PSUs”) At both March 31, 2016 and December 31, 2015, the target number of PSUs that were unvested was 656,549 and 849,021, respectively. 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, adjusted to reflect the reinvestment of all dividends declared and/or paid on our common stock, relative to an average of the per share price of our common stock over a 40 trading day period preceding 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 2016 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. During the three months ended March 31, 2016, equity compensation expense of $0.6 million was recognized in connection with the announced departures of two executives to reflect the pro-rated vesting of their PSUs through their expected departure dates in 2016 in accordance with the terms of their employment agreements. Employee Stock Purchase Plan ("ESPP") The ESPP allows a maximum of 450,000 shares of common stock to be purchased in aggregate for all employees. As of March 31, 2016 and December 31, 2015, 316,990 and 310,040 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at March 31, 2016.

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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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