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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |  | 1 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014 Restricted stock units [Member] | Mar. 31, 2014 Restricted stock units [Member] | Sep. 30, 2014 Restricted stock units [Member] | Mar. 31, 2014 Restricted stock units [Member] Awarded in 2014, 2013 and 2012 [Member] | Sep. 30, 2014 Stock Options [Member] | Mar. 31, 2014 Stock Options [Member] | Sep. 30, 2014 Stock Options [Member] | Mar. 31, 2014 Stock Options [Member] Awarded in 2014, 2013 and 2012 [Member] | Sep. 30, 2014 Plan [Member] | Mar. 31, 2014 Plan [Member] Stock Options [Member]
Share-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant |  |  |  |  |  |  |  |  |  | 6,900,000 |
Number of shares available for future grant (in shares) |  |  |  |  |  |  |  |  |  | 74,329 |
Number of shares of common stock exchanged for each award | 1 |  |  |  |  |  |  |  |  |  |
Aggregate number of shares approved |  | 5,508,333 |  | 5,508,333 |  | 2,785,465 |  | 2,785,465 |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 714,000 |  |  | 250,000
Number of restricted stock units for which performance targets are established (in shares) |  |  |  |  | 866,500 |  |  |  |  |  |
Compensation expense |  | $ 3.2 |  | $ 10.2 |  | $ 1.3 |  | $ 4.1 |  |  |
Unrecognized compensation cost related to the unvested awards |  | 15.7 |  | 15.7 |  | 9.2 |  | 9.2 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  |  | 2 years 9 months 18 days |  |  |  | 2 years 10 months 24 days |  |  |
Granted, weighted average grant date fair value (in dollars per share) |  |  | $ 27.33 | $ 27.39 |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  | (20,000) |  |  |  |  |  |  |
Number of stock option awards subject to performance targets (in shares) |  |  |  |  |  |  |  |  | 714,000 |  |
Weighted average grant date fair value |  |  |  |  |  |  | $ 17.69 | $ 17.69 |  |  |
Term of stock options |  |  |  |  |  |  |  | 10 years |  |  |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares) |  |  |  | 65,000 |  |  |  |  |  |  |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements (in shares) |  |  |  | 1,302,500 |  |  |  |  |  |  |
Number of vested and exercisable stock options (in shares) |  |  |  |  |  | 1,210,000 |  | 1,210,000 |  |  |
Vested and exercisable stock options, weighted average exercise price (in dollars per share) |  |  |  |  |  | $ 20.35 |  | $ 20.35 |  |  |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements (in shares) |  |  |  |  |  | 475,000 |  | 475,000 |  |  |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares) |  |  |  |  |  | 1,850,000 |  | 1,850,000 |  |  |
Outstanding shares |  |  |  |  |  | 1,989,000 |  | 1,989,000 |  |  |
Intrinsic value of outstanding stock options |  |  |  |  |  | $ 13.9 |  | $ 13.9 |  |  |
Weighted average remaining contractual term of outstanding stock options |  |  |  |  |  |  |  | 6 years 1 month 6 days |  |  |

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- Definition This line item represents the number of shares of common stock which are exchanged upon the vesting of the restricted stock unit awards. + References No definition available. + Details
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- Definition Number of stock option awards subject to the achievement of pre-tax income performance targets established by the Compensation Committee. + References No definition available. + Details
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- Definition Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements. + References No definition available. + Details
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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 Number of options which are granted and outstanding before approved for grant as of the date of balance sheet. + References No definition available. + Details
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- Definition Number of unvested stock option awards will vest based on the satisfaction of both service requirements and the achievement of performance metrics. + 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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 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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- 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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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