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Common Stock And Stock-Based Awards Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock Options | The following table summarizes activities related to the Company’s stock options:
|  |  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  | Weighted- |  | Average |  |  |
|  |  |  |  |  | Average |  | Remaining |  | Aggregate
|  |  | Number of |  |  | Exercise |  | Contractual |  | Intrinsic
(in thousands, except per share data) |  | Options |  |  | Price |  | Term (Years) |  |  | Value
| Outstanding as of December 31, 2014 |  | 2,437 |  |  | $ 20.07 |  |  |  |  |
| Granted |  | 289 |  |  | 23.14 |  |  |  |  |
| Exercised |  | (114) |  |  | 17.39 |  |  |  |  |
| Forfeited or expired |  | (32) |  |  | 23.40 |  |  |  |  |
| Outstanding as of December 31, 2015 |  | 2,580 |  |  | 20.49 |  |  |  |  |
| Exercised |  | (928) |  |  | 20.29 |  |  |  |  |
| Forfeited or expired |  | (455) |  |  | 23.49 |  |  |  |  |
| Outstanding as of December 31, 2016 |  | 1,197 |  |  | 19.51 |  |  |  |  |
| Exercised |  | (582) |  |  | 19.28 |  |  |  |  |
| Forfeited or expired |  | (19) |  |  | 19.76 |  |  |  |  |
| Outstanding as of December 31, 2017 |  | 596 |  |  | $ 19.72 |  | 5.28 |  | $ | 5,592
| Exercisable as of December 31, 2017 |  | 443 |  |  | $ 18.56 |  | 3.65 |  | $ | 4,667
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 time-based restricted stock units:
|  |  |  |  | Weighted-
|  |  |  |  | Average
|  |  | Number of |  | Grant Date
(in thousands, except per share data) |  | Units |  | Fair Value
| Non-vested awards outstanding as of December 31, 2014 |  | 412 |  | $ 20.33
| Granted |  | 228 |  | 23.06
| Vested |  | (161) |  | 20.51
| Forfeited |  | (12) |  | 21.03
| Non-vested awards outstanding as of December 31, 2015 |  | 467 |  | 21.59
| Granted |  | 392 |  | 22.71
| Vested |  | (209) |  | 21.07
| Forfeited |  | (125) |  | 21.85
| Non-vested awards outstanding as of December 31, 2016 |  | 525 |  | 22.57
| Granted |  | 314 |  | 31.56
| Vested |  | (206) |  | 21.84
| Forfeited |  | (40) |  | 24.21
| Non-vested awards outstanding as of December 31, 2017 |  | 593 |  | $ 27.47
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 activities related to the Company’s performance-based restricted stock units:
|  |  |  |  | Weighted-
|  |  |  |  | Average
|  |  | Number of |  | Grant Date
(in thousands, except per share data) |  | Units |  | Fair Value
| Non-vested units outstanding as of December 31, 2014 |  | 274 |  | $ 18.56
| Granted(1) |  | 85 |  | 22.93
| Forfeited |  | (53) |  | 18.57
| Non-vested units outstanding as of December 31, 2015 |  | 306 |  | 19.77
| Granted(1) |  | 184 |  | 21.63
| Forfeited |  | (263) |  | 19.64
| Non-vested units outstanding as of December 31, 2016 |  | 227 |  | 21.43
| Granted(1) |  | 172 |  | 31.60
| Forfeited |  | (53) |  | 18.81
| Non-vested units outstanding as of December 31, 2017 |  | 346 |  | $ 26.88
(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://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=96867065&loc=d3e5070-113901 Reference 2: 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=96867065&loc=d3e5047-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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