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Compensation Plans | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Compensation Plans | Compensation Plans Stock Based Compensation On May 11, 2006, the Company’s stockholders approved the 2006 Performance Incentive Plan, which was amended and restated in 2009 (“the 2006 Plan”). On May 1, 2014, the Company’s stockholders approved the 2014 Performance Incentive Plan (“the 2014 Plan”) (collectively, the “Plans”). Following the adoption of the 2014 Plan, no new awards will be issued under the 2006 Plan. The Plans provide for the granting of stock-based compensation, including stock options, restricted stock, and restricted stock units to officers, employees, and directors in connection with their employment with or services provided to the Company. The maximum number of shares reserved for awards under the 2014 Plan is 33 million shares, and, as of December 31, 2020, 27 million of the reserved shares under the 2014 Plan are available for future awards, of which 18 million shares may be issued as restricted stock or restricted stock units. Total share-based compensation expense recognized during the years ended December 31, 2020, 2019, and 2018 was $21 million, $18 million, and $15 million, respectively. The year ended December 31, 2019 includes a $1 million charge recognized in general and administrative expenses primarily resulting from accelerated vesting of restricted stock units related to the departure of the Company's former Executive Vice President – Senior Housing. The year ended December 31, 2018 includes a $2 million charge recognized in general and administrative expenses primarily resulting from accelerated vesting of restricted stock units related to the departure of the Company's Executive Chairman. As of December 31, 2020, there was $29 million of future expense related to unvested share-based compensation arrangements granted under the Company’s incentive plans, which is expected to be recognized over a weighted average period of two years associated with future employee service. Stock Options There have been no grants of stock options since 2014. Stock options outstanding and exercisable were 0.5 million at December 31, 2020 and 0.6 million at December 31, 2019. Proceeds received from stock options exercised under the Plans for the years ended December 31, 2020, 2019, and 2018 were $2 million, $5 million, and $2 million, respectively. Compensation expense related to stock options was immaterial for all periods presented. Restricted Stock Awards Under the Plans, restricted stock awards, including restricted stock units and performance stock units are granted subject to certain restrictions. Conditions of vesting are determined at the time of grant. Restrictions on certain awards generally lapse, as provided in the Plans or in the applicable award agreement, upon retirement, a change in control or other specified events. The fair market value of restricted stock awards, both time vesting and those subject to specific performance criteria, are expensed over the period of vesting. Restricted stock units, which vest based solely upon passage of time generally vest over a period of three to six years. The fair value of restricted stock units is determined based on the closing market price of the Company's shares on the grant date. Performance stock units, which are restricted stock awards that vest dependent upon attainment of various levels of performance that equal or exceed threshold levels, generally vest in their entirety at the end of a three year performance period. The number of shares that ultimately vest can vary from 0% to 200% of target depending on the level of achievement of the performance criteria. The fair value of performance stock units is determined based on the Monte Carlo valuation model. The compensation expense recognized for all restricted stock awards is net of actual forfeitures. Upon vesting of restricted stock awards, the participant is required to pay the related tax withholding obligation. Participants can generally elect to have the Company reduce the number of common stock shares delivered to pay the employee tax withholding obligation. The value of the shares withheld is dependent on the closing market price of the Company’s common stock on the trading date prior to the relevant transaction occurring. During the years ended December 31, 2020, 2019, and 2018, the Company withheld 298,000, 162,000, and 141,000 shares, respectively, to offset tax withholding obligations with respect to the vesting of the restricted stock and performance restricted stock unit awards. Holders of restricted stock awards, including restricted stock units and performance stock units, are generally entitled to receive dividends equal to the amount that would be paid on an equivalent number of shares of common stock. The following table summarizes restricted stock award activity, including performance stock units, for the year ended December 31, 2020 (units in thousands):
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  |  |  |
Unvested at January 1, 2020 | 1,700 |  |  | $ | 28.56 |  |  |  |  |
Granted | 693 |  |  | 39.79 |  |  |  |  |
Vested | (668) |  |  | 31.30 |  |  |  |  |
Forfeited | (42) |  |  | 31.55 |  |  |  |  |
Unvested at December 31, 2020 | 1,683 |  |  | 32.02 |  |  |  |  |
At December 31, 2020, the weighted average remaining vesting period of restricted stock and performance based units was two years. The total fair value (at vesting) of restricted stock and performance based units which vested for the years ended December 31, 2020, 2019, and 2018 was $20 million, $14 million, and $10 million, respectively.

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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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