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Equity Compensation Plans | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Equity Compensation Plans | Equity Compensation Plans At September 30, 2019 and December 31, 2018, 4,187,924 and 4,616,776 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 $23 million at September 30, 2019, as shown in the following table. Table 18.1 – Activities of Equity Compensation Costs by Award Type
|  | Nine Months Ended September 30, 2019
(In Thousands) |  | Restricted Stock Awards |  | Restricted Stock Units |  | Deferred Stock Units |  | Performance Stock Units |  | Employee Stock Purchase Plan |  | Total
Unrecognized compensation cost at beginning of period |  | $ | 3,498 |  |  | $ | 74 |  |  | $ | 14,489 |  |  | $ | 7,061 |  |  | $ | — |  |  | $ | 25,122 |
Equity grants |  | — |  |  | 3,483 |  |  | 4,831 |  |  | — |  |  | 160 |  |  | 8,474 |
Equity grant forfeitures |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Equity compensation expense |  | (1,137 | ) |  | (499 | ) |  | (5,871 | ) |  | (2,505 | ) |  | (120 | ) |  | (10,132 | )
Unrecognized Compensation Cost at End of Period |  | $ | 2,361 |  |  | $ | 3,058 |  |  | $ | 13,449 |  |  | $ | 4,556 |  |  | $ | 40 |  |  | $ | 23,464 |
At September 30, 2019, the weighted average amortization period remaining for all of our equity awards was two years. Restricted Stock Awards ("RSAs") At September 30, 2019 and December 31, 2018, there were 218,022 and 334,606 shares, respectively, of RSAs outstanding. Restrictions on these shares lapse through 2022. During the nine months ended September 30, 2019, there were no RSAs granted, restrictions on 116,584 RSAs lapsed and those shares were distributed, and no RSAs forfeited. Restricted Stock Units ("RSUs") At September 30, 2019 and December 31, 2018, there were 229,943 and 4,876 shares, respectively, of RSUs outstanding. Restrictions on these shares lapse through 2023. During the nine months ended September 30, 2019, there were 225,067 RSUs granted, no RSUs distributed, and no RSUs forfeited. Deferred Stock Units (“DSUs”) At September 30, 2019 and December 31, 2018, there were 2,414,056 and 2,336,720 DSUs, respectively, outstanding of which 1,345,005 and 1,181,622, respectively, had vested. During the nine months ended September 30, 2019, there were 337,787 DSUs granted, 260,451 DSUs distributed, and no DSUs forfeited. Unvested DSUs at September 30, 2019 vest through 2023. Performance Stock Units (“PSUs”) At both September 30, 2019 and December 31, 2018, the target number of PSUs that were unvested was 725,616. Vesting for all PSUs will generally occur at the end of three years from their grant date based on various TSR performance calculations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2018. Employee Stock Purchase Plan ("ESPP") The ESPP allows a maximum of 600,000 shares of common stock to be purchased in aggregate for all employees. As of September 30, 2019 and December 31, 2018, 418,651 and 390,569 shares had been purchased, respectively, and there remained a negligible amount of uninvested employee contributions in the ESPP at September 30, 2019.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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