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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Nov. 14, 2016 $ / shares shares | Sep. 12, 2016 $ / shares shares | Aug. 02, 2016 shares | May 26, 2016 shares | May 09, 2016 $ / shares shares | May 31, 2014 shares | Jun. 30, 2014 shares | Dec. 31, 2016 USD ($) director shares | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) director $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares) |  |  |  |  |  |  |  | 5,000,000.0 |  | 5,000,000.0 |
Number of additional shares authorized (in shares) |  |  |  |  |  |  | 1,800,000.0 |  |  |  |
Maximum number of shares per participant, 12 month period (in shares) |  |  |  |  |  | 1,000,000.0 | 2,500,000.0 |  |  |  |
Extension of plan term |  |  |  |  |  |  | 10 years |  |  |  |
Share-based compensation costs charged against income | $ |  |  |  |  |  |  |  | $ 2.4 | $ 2.1 | $ 6.3 | $ 7.1
Tax benefit recognized from share-based compensation expense | $ |  |  |  |  |  |  |  | 1.3 | $ 0.7 | 2.5 | 2.5
Unrecognized compensation costs related to nonvested awards | $ |  |  |  |  |  |  |  | $ 10.5 |  | $ 10.5 |
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition |  |  |  |  |  |  |  |  |  | 10 months 24 days |
Total fair value of vested shares | $ |  |  |  |  |  |  |  |  |  | $ 6.0 | 6.6
Cash received from exercise of stock options | $ |  |  |  |  |  |  |  |  |  | 3.4 | 6.6
Tax benefit realized from exercise of stock options | $ |  |  |  |  |  |  |  |  |  | $ 1.8 | $ 3.5
Shares available for issuance under the Plan (in shares) |  |  |  |  |  |  |  | 2,400,000 |  | 2,400,000 |
Stock options granted (in shares) |  |  |  |  |  |  |  |  |  | 264,300 | 208,200
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Board of directors, number of directors | director |  |  |  |  |  |  |  | 6 |  | 6 |
Options, Additional Disclosures: |  |  |  |  |  |  |  |  |  |  |
Options granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 21.75 | $ 17.24
Options exercised, aggregate intrinsic value | $ |  |  |  |  |  |  |  |  |  | $ 2.4 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Shares issued in period (in shares) |  |  |  |  |  |  |  |  |  | 94,718 | 153,603
Granted in period to each independent director (in shares) |  |  | 1,896 |  | 49,064 |  |  |  |  | 68,400 | 266,100
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Period following director's term in which RSUs may be settled |  |  | 6 months |  |  |  |  |  |  |  |
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 55.44 | $ 42.41
Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  |  | 224,843 |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Expected term in years |  |  |  |  | 10 years |  |  |  |  |  |
Stock options granted, exercise price (in USD per share) | $ / shares |  |  |  |  | $ 57.18 |  |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 3 years |
Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 5 years |
Options, Additional Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award exercisability period, from date of grant |  |  |  |  |  |  |  |  |  | 10 years |
Restricted Shares | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 3 years |
Restricted Shares | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 5 years |
Chief Financial Officer | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Granted in period to each independent director (in shares) |  | 5,012 |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Chief Financial Officer | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  | 25,746 |  |  |  |  |  |  |  |  |
Expected term in years |  | 10 years |  |  |  |  |  |  |  |  |
Stock options granted, exercise price (in USD per share) | $ / shares |  | $ 47.39 |  |  |  |  |  |  |  |  |
Senior Vice President | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Granted in period to each independent director (in shares) | 2,664 |  |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |
Senior Vice President | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) | 13,683 |  |  |  |  |  |  |  |  |  |
Expected term in years | 10 years |  |  |  |  |  |  |  |  |  |
Stock options granted, exercise price (in USD per share) | $ / shares | $ 50.06 |  |  |  |  |  |  |  |  |  |
Employee | Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 3 years |
Director | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Granted in period to each independent director (in shares) |  |  |  | 346 |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Number of common shares into which each RSU may be converted (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Director | Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 1 year |
First year anniversary | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  |  |  |  | 33.30% |  |  |  |  |  |
First year anniversary | Chief Financial Officer | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  | 33.30% |  |  |  |  |  |  |  |  |
First year anniversary | Senior Vice President | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage | 33.30% |  |  |  |  |  |  |  |  |  |
Second year anniversary | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  |  |  |  | 33.30% |  |  |  |  |  |
Second year anniversary | Chief Financial Officer | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  | 33.30% |  |  |  |  |  |  |  |  |
Second year anniversary | Senior Vice President | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage | 33.30% |  |  |  |  |  |  |  |  |  |
Third year anniversary | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  |  |  |  | 33.30% |  |  |  |  |  |
Third year anniversary | Chief Financial Officer | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage |  | 33.30% |  |  |  |  |  |  |  |  |
Third year anniversary | Senior Vice President | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |  |  |  |
Annual award vesting percentage | 33.30% |  |  |  |  |  |  |  |  |  |

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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 Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 + 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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per 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 -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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The grant-date intrinsic 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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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