Share-Based Payments (Narrative) (Details)	6 Months Ended
Jun. 30, 2016 USD ($) shares
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	25 years
Expected volatility measurement period	5 years
Unrecognized compensation costs	$ 6,866,000
Unrecognized compensation costs, period for recognition	2 years 6 months
Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares authorized for grant \| shares	1,000,000
Senior Executive and Employee Performance Share Unit Plans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units available for grant as a percentage of target	0.00%
Senior Executive and Employee Performance Share Unit Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units available for grant as a percentage of target	200.00%
Performance Share Units, Equity Classified Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 6,432,000
Unrecognized compensation costs, period for recognition	2 years 2 months 12 days
Performance Share Units, Liability Classified Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 8,044,000
Unrecognized compensation costs, period for recognition	2 years 2 months 12 days
Estimated weighted average price period	20 days
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 1,479,000
Unrecognized compensation costs, period for recognition	10 months 24 days
Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0
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

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

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Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Term 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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Share Based Compensation Arrangement By Share Based Payment Award, Number Of Units Available For Grant As Percentage Of Target

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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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
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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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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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