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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Stock-Based Awards | As of September 30, 2018, the unrecognized compensation cost and remaining weighted-average amortization related to stock-based awards were as follows:
|  |  |  |  |  | Performance-
|  |  |  | Time-based |  | based
|  |  |  | Restricted |  | Restricted
|  | Stock |  | Stock |  | Stock
(in thousands, except remaining period data) |  | Options |  | Units |  | Units(1)
Unrecognized compensation cost |  | $ 112 |  | $ 15,143 |  | $ 4,315
Remaining weighted-average |  |  |  |  |  |  |  |
amortization period |  | 0.4 years |  | 2.4 years |  | 1.4 years
(1) Based on the probable achievement of the performance goals identified in each award.
Summary Of Stock Options | The following table summarizes activities relating to the Company’s stock options:
|  |  |  |  |  |  | Weighted- |  |
|  |  |  |  | Weighted- |  | Average |  | Aggregate
|  | Number of |  |  | Average |  | Remaining |  | Intrinsic
|  | Options |  |  | Exercise |  | Contractual |  | Value
|  | (in thousands) |  |  | Price |  | Term (Years) |  | (in thousands)
Outstanding as of December 31, 2017 |  | 596 |  |  | $19.72 |  |  |  |
Exercised |  | (187) |  |  | 18.61 |  |  |  |
Forfeited or expired |  | (20) |  |  | 22.98 |  |  |  |
Outstanding as of September 30, 2018 |  | 389 |  |  | $20.09 |  | 4.48 |  | $ 1,288
Exercisable as of September 30, 2018 |  | 354 |  |  | $19.78 |  | 3.51 |  | $ 1,279
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards | The following table summarizes the activities related to the Company’s ti me-based restricted stock units:
|  |  |  |  | Weighted-
|  | Number of |  |  | Average
|  | Units |  |  | Grant Date
|  | (in thousands) |  |  | Fair Value
Non-vested units outstanding as of December 31, 2017 |  | 593 |  |  | $27.47
Granted |  | 402 |  |  | 29.52
Vested |  | (229) |  |  | 26.79
Forfeited |  | (86) |  |  | 27.35
Non-vested units outstanding as of September 30, 2018 |  | 680 |  |  | $28.93
Performance-Based Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards | The following table summarizes the activi ties related to the Company’s performance-based restricted stock units:
|  |  |  |  |  | Weighted-
|  |  | Number of |  |  | Average
|  |  | Units |  |  | Grant Date
|  |  | (in thousands) |  |  | Fair Value
Non-vested units outstanding as of December 31, 2017 |  |  | 346 |  |  | $26.88
Granted (1) |  |  | 120 |  |  | 29.60
Forfeited |  |  | (147) |  |  | 24.06
Non-vested units outstanding as of September 30, 2018 |  |  | 319 |  |  | $29.19
(1) Represents target number of units that can vest based on the achievement of the performance goals.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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 of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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