Share-Based Payments (Narrative) (Details)	3 Months Ended
Mar. 31, 2016 USD ($) item
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service period	60 days
Maximum employee contribution, percentage	4.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage	50.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage	100.00%
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate measurement period	5 years
Expected life measurement period	5 years
Expected volatility measurement period	5 years
Unrecognized compensation costs \| $	$ 8,107,000
Unrecognized compensation costs, period for recognition	2 years 10 months 24 days
Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans \| item	2
Restricted Share Units and Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated weighted average price period	20 days

Employee Stock Purchase Plan, Employer Matching Contribution, Percent of Match

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Employee Stock Purchase Plan, Maximum Annual Contributions Per Employee, Percent

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Estimated Weighted Average Price Period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Term Measurement Period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Measurement Period

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Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Measurement Period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Number Of Plans

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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

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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.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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

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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.

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