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Equity Compensation Plans | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At June 30, 2017 and December 31, 2016, 1,533,427 and 1,787,974 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 $19 million at June 30, 2017, as shown in the following table. Table 16.1 – Activities of Equity Compensation Costs by Award Type
|  | Six Months Ended June 30, 2017
(In Thousands) |  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 2,091 |  |  | $ | 11,506 |  |  | $ | 4,549 |  |  | $ | — |  |  | $ | 18,146 |
Equity grants |  | 2,237 |  |  | 4,547 |  |  | — |  |  | 129 |  |  | 6,913 |
Equity grant forfeitures |  | (174 | ) |  | (472 | ) |  | — |  |  | — |  |  | (646 | )
Equity compensation expense |  | (602 | ) |  | (3,472 | ) |  | (1,159 | ) |  | (64 | ) |  | (5,297 | )
Unrecognized Compensation Cost at End of Period |  | $ | 3,552 |  |  | $ | 12,109 |  |  | $ | 3,390 |  |  | $ | 65 |  |  | $ | 19,116 |
At June 30, 2017, the weighted average amortization period remaining for all of our equity awards was less than two years. Restricted Stock At June 30, 2017 and December 31, 2016, there were 266,857 and 204,515 shares, respectively, of restricted stock outstanding. Restrictions on these shares lapse through 2021. During the six months ended June 30, 2017, there were 134,364 shares of restricted stock granted, restrictions on 60,270 shares of restricted stock lapsed and those shares were distributed, and 11,752 shares of restricted stock awards forfeited. Deferred Stock Units (“DSUs”) At June 30, 2017 and December 31, 2016, there were 1,791,305 and 1,848,861 DSUs, respectively, outstanding of which 876,728 and 939,899, respectively, had vested. During the six months ended June 30, 2017, there were 281,229 DSUs granted, 306,911 DSUs distributed, and 31,875 DSUs forfeited. Unvested DSUs at June 30, 2017 vest through 2021. During the first quarter of 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 June 30, 2017 and December 31, 2016, the target number of PSUs that were unvested was 642,879. Vesting for PSUs will generally occur at the end of three years from their grant date based on various total shareholder return (“TSR”) performance calculations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2016. 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 June 30, 2017 and December 31, 2016, 348,652 and 337,271 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at June 30, 2017.

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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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