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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders' Equity 1.625% Exchange As described in Note 7, “Debt,” we issued 1.8 million shares of our common stock in connection with the 1.625% Exchange in March 2018. 1.125% Warrants In connection with the Call Spread Overlay transaction described in Note 8, “Derivatives,” in 2013, we issued 13.5 million warrants with a strike price of $53.8475 per share. Under certain circumstances, beginning in April 2020, if the price of our common stock exceeds the strike price of the 1.125% Warrants, we will be obligated to issue shares of our common stock subject to a share delivery cap. The 1.125% Warrants could separately have a dilutive effect to the extent that the market value per share of our common stock exceeds the applicable strike price of the 1.125% Warrants. Refer to Note 3, “Net Income (Loss) per Share,” for dilution information for the periods presented. We will not receive any additional proceeds if the 1.125% Warrants are exercised. As described in Note 8, “Derivatives,” in June 2018, we entered into privately negotiated termination agreements with each of the Counterparties to partially terminate the Call Spread Overlay, in notional amounts corresponding to the aggregate principal amount of the 1.125% Convertible Notes purchased. We paid $113 million to the Counterparties for the termination of 2.4 million of the 1.125% Warrants outstanding, which resulted in a reduction of additional paid-in capital for the same amount. Following this transaction, 11.1 million of the 1.125% Warrants remain outstanding. Share-Based Compensation In connection with our equity incentive plans and employee stock purchase plan, approximately 276,000 shares of common stock vested or were purchased, net of shares used to settle employees’ income tax obligations, during the six months ended June 30, 2018. We record share-based compensation as “General and administrative expenses” in the accompanying consolidated statements of operations. As of June 30, 2018, there was $46 million of total unrecognized compensation expense related to unvested restricted stock awards (RSAs), performance stock awards (PSAs), and performance stock units (PSUs), which we expect to recognize over a remaining weighted-average period of 3.1 years, 0.7 years and 2.6 years, respectively. This unrecognized compensation cost assumes an estimated forfeiture rate of 10.8% for non-executive employees as of June 30, 2018. Also as of June 30, 2018, there was $12 million of total unrecognized compensation expense related to unvested stock options, which we expect to recognize over a weighted-average period of 2.3 years. No stock options were granted or exercised in the six months ended June 30, 2018. Activity for RSAs, PSAs and PSUs, for the six months ended June 30, 2018, is summarized below:
| Restricted Stock Awards |  | Performance Stock Awards |  | Performance Stock Units |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2017 | 401,804 |  |  | 84,762 |  |  | 91,828 |  |  | 578,394 |  |  | $ | 58.35 |
Granted | 346,491 |  |  | — |  |  | 211,969 |  |  | 558,460 |  |  | 73.43 |
Vested | (183,595 | ) |  | (32,929 | ) |  | — |  |  | (216,524 | ) |  | 57.04 |
Forfeited | (124,690 | ) |  | (48,701 | ) |  | (101,320 | ) |  | (274,711 | ) |  | 63.38 |
Unvested balance, June 30, 2018 | 440,010 |  |  | 3,132 |  |  | 202,477 |  |  | 645,619 |  |  | 69.69 |
The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
| Six Months Ended June 30,
| 2018 |  | 2017
| (In millions)
Granted: |  |  |
Restricted stock awards | $ | 25 |  |  | $ | 19 |
Performance stock units | 16 |  |  | 16 |
| $ | 41 |  |  | $ | 35 |
Vested: |  |  |
Restricted stock awards | $ | 14 |  |  | $ | 20 |
Performance stock awards | 3 |  |  | 15 |
Performance stock units | — |  |  | 9 |
| $ | 17 |  |  | $ | 44 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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