Share-Based Payments (Narrative) (Details)	12 Months Ended
Dec. 31, 2015 USD ($) item $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price measurement period	20 days
Employee service period	1 year
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]
Remaining shares authorized for grant \| shares	1,874,798	2,665,618
Weighted average share price of options exercised \| $ / shares	$ 27.78	$ 24.77	$ 21.13
Weighted average share price of options exercised \| $ / shares	21.11	18.28	14.37
Weighted average grant date fair value of options granted \| $ / shares	$ 5.39	$ 5.35	$ 5.65
Risk free interest rate measurement period	5 years
Expected life measurement period	5 years
Expected volatility measurement period	5 years
Unrecognized compensation costs \| $	$ 3,661,000
Unrecognized compensation costs, period for recognition	2 years 6 months
Cash received from stock-based award exercises \| $	$ 29,816,000	$ 12,121,000	$ 6,152,000
Actual tax benefit realized from option exercise \| $	$ 1,150,000	476,000	197,000
Stock Option Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Award term	10
Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $	$ 8,642,000
Unrecognized compensation costs, period for recognition	1 year 10 months 24 days
Number of plans \| item	2
Share price measurement period	20 days
Fair value of shares vested and released \| $	$ 1,253,000	1,578,000	$ 0
Share unit settlement liability \| $	$ 11,836,000	$ 7,433,000
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%
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 [Member] \| Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted \| shares	218,699	186,554	78,831
Weighted average grant date fair value of units granted \| $ / shares	$ 24.57	$ 23.82	$ 21.99
Restricted Share Units [Member] \| Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted \| shares	20,528	237,645	278,771
Weighted average grant date fair value of units granted \| $ / shares	$ 26.38	$ 22.86	$ 21.78
Deferred Share Units [Member] \| Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted \| shares	29,072	22,665	19,624
Weighted average grant date fair value of units granted \| $ / shares	$ 26.07	$ 22.66	$ 21.99
Restricted Share Units and Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price measurement period	20 days

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Additionally, share-based awards which were paid or settled.

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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, Number Of Units Available For Grant As Percentage Of Target

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Share Based Compensation Arrangement By Share Based Payment Award, Share Market Price Measurement Period

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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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.

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Unrecognized cost of unvested share-based compensation awards.

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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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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.

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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).

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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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Net number of non-option equity instruments granted to participants.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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