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Stock Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity for the nine months ended September 30, 2018 follows (shares in thousands):
|  | Stock Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2017 |  | 1,758 |  |  | $ | 26.35 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (1 | ) |  | 15.66 |  |  |  |  |
Forfeited and expired |  | (597 | ) |  | 23.72 |  |  |  |  |
Outstanding at September 30, 2018 |  | 1,160 |  |  | 27.72 |  |  | 1.42 |  | $ | 0.2 |
Expected to vest at September 30, 2018 |  | 6 |  |  | 11.99 |  |  | 4.20 |  | $ | 0.1 |
Exercisable at September 30, 2018 |  | 1,154 |  |  | 27.81 |  |  | 1.41 |  | $ | 0.2 |
Summary of Restricted Stock Unit Activity | A summary of restricted stock unit activity for the nine months ended September 30, 2018 follows (shares in thousands):
|  | Restricted Stock Units |  | Weighted- Average Grant-Date Fair Value
Outstanding at December 31, 2017 |  | 1,688 |  |  | $ | 13.39 |
Granted |  | 1,449 |  |  | 12.53 |
Vested |  | (767 | ) |  | 13.43 |
Forfeited and expired |  | (198 | ) |  | 12.57 |
Outstanding at September 30, 2018 |  | 2,172 |  |  | 12.90 |
Schedule of Assumptions Used | The fair value of awards with market conditions was estimated using a Monte Carlo simulation with the following weighted-average assumptions:
|  | Nine Months Ended September 30, 2018
Weighted-average fair value of grant |  | $ | 15.20 |
Risk-free interest rate(i) |  | 2.26 | %
Expected volatility(ii) |  | 52.97 | %
Expected life of restricted stock units in years(iii) |  | 2.88 |
Expected dividend yield |  | — | %
(i) | Represents the continuously compounded semi-annual zero-coupon U.S. treasury rate commensurate with the remaining performance period
(ii) | Based on historical volatility for the company that is commensurate with the length of the performance period
(iii) | Represents the remaining life of the longest performance period

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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