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Stock Options | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Options | Stock Options Under stockholder approved stock-based plans, stock options, stock appreciation rights, restricted stock and restricted stock units may be granted to officers, directors and other key employees. At June 30, 2017, 3.1 million shares of unissued common stock of the company were available for granting under these plans. There were no grants of stock option awards during the six months ended June 30, 2017. For the six months ended June 30, 2016, the fair value of stock option awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values:
|  | Six Months Ended June 30, 2016
Weighted-average fair value of grant |  | $ | 4.53 |
Risk-free interest rate |  | 1.29 | %
Expected volatility |  | 51.30 | %
Expected life of options in years |  | 4.90 |
Expected dividend yield |  | — |
Restricted stock unit awards may contain time-based units, performance-based units or a combination of both. Each performance-based unit will vest into zero to two shares depending on the degree to which the performance goals are met. Compensation expense resulting from these awards is recognized as expense ratably for each installment from the date of grant until the date the restrictions lapse, and is based on the fair market value at the date of grant and the probability of achievement of the specific performance-related goals. The company records all share-based expense in selling, general and administrative expense. During the six months ended June 30, 2017 and 2016, the company recorded $6.2 million and $5.3 million of share-based compensation expense, respectively, which was comprised of $5.6 million and $4.3 million of restricted stock unit expense and $0.6 million and $1.0 million of stock option expense, respectively. A summary of stock option activity for the six months ended June 30, 2017 follows (shares in thousands):
Options |  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2016 |  | 2,099 |  |  | $ | 25.41 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (1 | ) |  | 10.65 |  |  |  |  |
Forfeited and expired |  | (306 | ) |  | 20.04 |  |  |  |  |
Outstanding at June 30, 2017 |  | 1,792 |  |  | 26.33 |  |  | 2.09 |  | $ | — |
Expected to vest at June 30, 2017 |  | 211 |  |  | 22.72 |  |  | 4.00 |  | — |
Exercisable at June 30, 2017 |  | 1,574 |  |  | 26.84 |  |  | 1.82 |  | — |
The aggregate intrinsic value represents the total pretax value of the difference between the company’s closing stock price on the last trading day of the period and the exercise price of the options, multiplied by the number of in-the-money stock options that would have been received by the option holders had all option holders exercised their options on June 30, 2017. The intrinsic value of the company’s stock options changes based on the closing price of the company’s stock. The total intrinsic value of options exercised for the six months ended June 30, 2017 was immaterial, and for the six months ended June 30, 2016 was zero. As of June 30, 2017, $0.7 million of total unrecognized compensation cost related to stock options is expected to be recognized over a weighted-average period of one year. A summary of restricted stock unit activity for the six months ended June 30, 2017 follows (shares in thousands):
|  | Restricted Stock Units |  | Weighted- Average Grant-Date Fair Value
Outstanding at December 31, 2016 |  | 1,454 |  |  | $ | 12.68 |
Granted |  | 977 |  |  | 14.06 |
Vested |  | (544 | ) |  | 13.30 |
Forfeited and expired |  | (162 | ) |  | 11.41 |
Outstanding at June 30, 2017 |  | 1,725 |  |  | 13.46 |
The fair value of restricted stock units is determined based on the trading price of the company’s common shares on the date of grant. The aggregate weighted-average grant-date fair value of restricted stock units granted during the six months ended June 30, 2017 and 2016 was $13.7 million and $12.5 million, respectively. As of June 30, 2017, there was $14.7 million of total unrecognized compensation cost related to outstanding restricted stock units granted under the company’s plans. That cost is expected to be recognized over a weighted-average period of 2.3 years. The aggregate weighted-average grant-date fair value of restricted stock units vested during the six months ended June 30, 2017 and 2016 was $7.2 million and $3.4 million, respectively. Common stock issued upon exercise of stock options or upon lapse of restrictions on restricted stock units are newly issued shares. Cash received from the exercise of stock options for the six months ended June 30, 2017 was immaterial, and for the six months ended June 30, 2016 was zero. In light of its tax position, the company is currently not recognizing any tax benefits from the exercise of stock options or upon issuance of stock upon lapse of restrictions on restricted stock units. Tax benefits resulting from tax deductions in excess of the compensation costs recognized are classified as operating cash flows.

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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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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