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Share-Based Compensation (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended | 120 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 20, 2015 | May 15, 2012 | Feb. 17, 2000 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 17, 2010 | May 31, 2013 | Mar. 23, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total Intrinsic value of stock options exercised |  |  |  | $ 6,800,000 |  |  |  |  |
Cash received from exercise of stock options |  |  |  | 14,900,000 | $ 27,100,000 | $ 24,900,000 |  |  |
Proceeds from issuance of common stock under the ESPP |  |  |  | $ 15,000,000 | $ 14,600,000 | $ 10,000,000 |  |  |
Number of Shares, Granted (in shares) |  |  |  | 0 | 0 | 0 |  |  |
Pre-vesting forfeitures (as a percent) |  |  |  | 11.00% | 11.00% | 11.00% |  |  |
Period after termination in which options can be exercised (in days) |  | 90 days |  |  |  |  |  |  |
Period after termination in which options can be exercised in case of death or disability (in years) |  | 1 year |  |  |  |  |  |  |
Number of options vested and expected to vest (in shares) |  |  |  | 3,300,000 |  |  |  |  |
Weighted average exercise price of options vested and expected to vest (in dollars per share) |  |  |  | $ 7.75 |  |  |  |  |
Net stock options as a percentage of outstanding shares at beginning of period |  |  |  | (0.01%) | (0.02%) |  |  |  |
Share-based compensation expense before income taxes |  |  |  | $ 56,100,000 | $ 46,900,000 | $ 45,800,000 |  |  |
2000 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved and available for grant (in shares) |  |  |  |  |  |  | 30,500,000 |  |
Additional common shares reserved for issuance as a percentage of common stock outstanding |  |  |  |  |  |  | 3.00% |  |
Term of grant agreement (in years) |  | 10 years |  |  |  |  |  |  |
Amended And Restated Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuance under the plan (in shares) |  | 59,100,000 |  |  |  |  |  |  | 33,000,000
Term of grant agreement (in years) |  | 7 years |  |  |  |  |  |  |
Aggregate of common stock available for grant (in shares) |  |  |  | 19,800,000 |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Cash received from exercise of stock options |  |  |  | $ 14,900,000 |  |  |  |  |
Proceeds from issuance of common stock under the ESPP |  |  |  | 15,000,000 |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  |  | $ 100,000 |  |  |  |  |
Recognition period for compensation expense (in years) |  |  |  | 7 months 6 days |  |  |  |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |  |
Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |  |  |
Time Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  |  | $ 61,300,000 |  |  |  |  |
Compensation expense recognized on restricted stock units |  |  |  | $ 31,700,000 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognition period for compensation expense (in years) |  |  |  | 1 year 9 months 18 days |  |  |  |  |
Aggregate of common stock available for grant (in shares) |  |  |  | 4,900,000 |  |  |  |  |
Restricted Stock [Member] | Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Equity awards granted in period (in shares) |  |  |  | 200,000 |  |  |  |  |
Weighted average grant date fair value (In dollars per share) |  |  |  | $ 9.81 |  |  |  |  |
Share-based compensation expense before income taxes |  |  |  | $ 1,800,000 |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate of common stock available for grant (in shares) | 23,500,000 |  |  |  |  |  |  | 18,000,000 |
Maximum employee subscription rate for the ESPP (as a percent) |  |  | 10.00% |  |  |  |  |  |
Discount rate from market value paid by participants for shares under the plan (as a percent) |  |  | 85.00% |  |  |  |  |  |
Maximum annual amount of purchases per employee under the plan |  |  | $ 25,000 |  |  |  |  |  |
Shares authorized for purchase per employee per quarter (in shares) |  |  | 500 |  |  |  |  |  |
Maximum fair value of shares employee may purchase in a quarter |  |  | $ 6,250 |  |  |  |  |  |
Shares issued pursuant to the employee stock purchase plan (in shares) |  |  |  | 1,800,000 | 1,700,000 | 1,300,000 |  |  |
Increase in number of shares available for grant | 5,500,000 |  |  |  |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  |  | $ 45,200,000 |  |  |  |  |
Pre-vesting forfeitures (as a percent) |  |  |  | 5.00% | 5.00% | 5.00% |  |  |
Equity awards granted in period (in shares) |  |  |  | 6,200,000 |  |  |  |  |
Compensation expense recognized on restricted stock units |  |  |  | $ 49,400,000 |  |  |  |  |
Weighted average grant date fair value (In dollars per share) |  |  |  | $ 9.50 |  |  |  |  |
Restricted Stock Units [Member] | Officers And Employees [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Equity awards granted in period (in shares) |  |  |  | 2,000,000 |  |  |  |  |
Restricted Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |  |
Performance Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  |  | $ 16,100,000 |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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