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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Restricted Stock Units [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of shares of common stock exchanged for each award |  |  | 1 |
Aggregate number of shares approved | 6,276,430 |  | 6,276,430 |
Weighted average grant date fair value |  |  | $ 23.07 |
Forfeited |  |  | 1,560 |
Compensation expense | $ 3.0 | $ 3.2 | $ 8.6 | $ 7.0
Unrecognized compensation cost related to the unvested awards | $ 15.8 |  | $ 15.8 |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 7 months 6 days |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics |  |  | 35,000 |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements |  |  | 1,685,097 |
Granted, Weighted average grant date fair value |  |  | $ 23.07 | $ 27.33
Restricted Stock Units [Member] | Awarded in 2015, 2013, and 2012 [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of restricted stock units for which performance targets are established |  |  | 321,500 |
Restricted Stock Units [Member] | Awarded in 2014, 2013 and 2012 [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of restricted stock units for which performance targets are established |  |  |  | 866,500
Stock Options [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Aggregate number of shares approved | 3,385,465 |  | 3,385,465 |
Weighted average grant date fair value |  |  | $ 12.48 |
Compensation expense | $ 1.1 | $ 1.3 | $ 4.7 | $ 2.9
Unrecognized compensation cost related to the unvested awards | $ 5.1 |  | $ 5.1 |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 2 months 12 days |
Term of stock options |  |  | 10 years |
Granted, Weighted average grant date fair value |  |  | $ 12.48 | $ 17.69
Number of vested and exercisable stock options | 1,485,000 |  | 1,485,000 |
Vested and exercisable stock options, weighted average exercise price | $ 19.57 |  | $ 19.57 |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements | 15,000 |  | 15,000 |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics | 1,425,000 |  | 1,425,000 |
Outstanding shares | 2,248,000 |  | 2,248,000 |
Intrinsic value of outstanding stock options | $ 8.4 |  | $ 8.4 |
Weighted average remaining contractual term of outstanding stock options |  |  | 5 years 8 months 12 days |
Granted | 0 |  | 259,000 |
Stock Options [Member] | Awarded in 2014, 2013 and 2012 [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of stock option awards subject to performance targets |  |  |  | 714,000
Stock Options [Member] | Awarded in 2015, 2014, 2013, And 2012 [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of stock option awards subject to performance targets |  |  | 259,000 |
Plan [Member] |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |
Number of shares authorized for grant | 8,500,000 |  | 8,500,000 |
Number of shares available for future grant | 46,768 |  | 46,768 |

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- Definition Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics. + References No definition available. + Details
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- Definition Represents the total number of awards approved to date by the Compensation Committee of the Company's Board of Directors. + References No definition available. + Details
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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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 number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -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 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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