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Compensation Plans | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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, 2017, 30 million of the reserved shares under the 2014 Plan are available for future awards of which 20 million shares may be issued as restricted stock and restricted stock units. Total share-based compensation expense recognized during the years ended December 31, 2017, 2016 and 2015 was $14 million, $23 million and $26 million, respectively. The year ended December 31, 2016 includes a $7 million charge recognized in general and administrative expenses primarily resulting from the termination of the Company’s former chief executive officer (“CEO”) that was comprised of the accelerated vesting of restricted stock units in accordance with the terms of the former CEO’s employment agreement. As of December 31, 2017 and 2016, there was $20 million and $14 million, respectively, 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 three years associated with future employee service. Conversion of Equity Awards at the Spin-Off Date The Plans were established with anti-dilution provisions, such that in the event of an equity restructuring of the Company (including spin-off transactions), equity awards would preserve their value post-transaction. In order to achieve an equitable modification of the existing awards following the Spin-Off, the Company converted pre-spin awards to their post-spin value, resulting in grants to remaining employees denominated solely in the Company’s common stock. The modification assumed a conversion ratio on all awards calculated as the final pre-spin closing price of the Company’s common stock divided by the five trading day average post-spin closing price (“Five Day Average Price”) of the Company’s common stock. The conversion impacted 133 participants, resulted in additional awards being granted and incremental fair value of unvested awards due to the difference between the Five Day Average Price and the pre-spin closing price on the Spin-Off date. The vesting periods were unchanged for unvested grants at the Spin-Off date. The incremental fair value of unvested awards was immaterial. Stock Options Stock options are granted with an exercise price per share equal to the closing market price of the Company’s common stock on the grant date. Stock options generally vest ratably over a three- to five-year period and have a 10-year contractual term. Vesting of certain stock options may accelerate, as provided in the Plans or in the applicable award agreement, upon retirement, a change in control or other specified events. There have been no grants of stock options since 2014. Stock options outstanding and exercisable were 1.1 million at December 31, 2017, and 1.3 million and 1.2 million at December 31, 2016, respectively. Proceeds received from stock options exercised under the Plans for the years ended December 31, 2017, 2016 and 2015 were $1 million, $4 million and $28 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 targeted 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, 2017, 2016 and 2015, the Company withheld 157,000, 237,000 and 200,000 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, 2017 (units and shares in thousands):
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2017 | 962 |  |  | $ | 37.39 |
Granted | 844 |  |  | 33.57 |
Vested | (419 | ) |  | 35.10 |
Forfeited | (248 | ) |  | 35.04 |
Unvested at December 31, 2017 | 1,139 |  |  | 33.41 |
At December 31, 2017, 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, 2017, 2016 and 2015 was $15 million, $24 million and $21 million, respectively. Subsequent events. The Company expects to record severance and related charges of approximately $9 million in the first quarter of 2018 related to the departure of our Executive Chairman, effective March 1, 2018.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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