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The percentage applied to the RSU valuation as determined by a monte carlo simulation.

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Employees may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to this percentage of the cash value of the bonus or commission, less applicable withholding tax.

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Number of options for which the exercise price is lower than the Company's share price.

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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.

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Aggregate number of common shares reserved for future issuance.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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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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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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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).

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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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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.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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).

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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.

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Gross number of share options (or share units) granted during the period.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Percentage of vesting of share-based compensation awards.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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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.

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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.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	21,100,000
Compensation cost capitalized	$ 1,100,000	$ 1,200,000	$ 900,000
Bonus Shares and Plans
Common shares reserved for future issuance	5,049,687	5,264,285	5,574,605
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	750,000
Share-based compensation expense	$ 80,000	$ 122,000	$ 62,000
Bonus Shares and Plans
Maximum percent of salary contributed	10.00%
Discount on market value of shares	15.00%
Shares issued	10,410	11,022	13,127
Stock Options [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option term	10 years
Vesting period	3 years
Share-based compensation expense	$ 73,000	$ 200,000	$ 1,500,000
Weighted average fair value of options granted (USD per share)	$ 0	$ 0	$ 4.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Exercise price for options outstanding lower limit (USD per share)	$ 20.32
Exercise price for options outstanding upper limit (USD per share)	$ 39.59
Weighted average remaining contractual life of option outstanding	4 years 8 months 28 days
Weighted average remaining contractual life of options exercisable	4 years 5 months 11 days
Total intrinsic value of options exercised	$ 1,400,000	$ 3,500,000	$ 400,000
Number of options outstanding and exercisable that had an exercise price lower than the Company's share price	1,400,000
Aggregate intrinsic value of options	$ 11,400,000
Total cash received from the exercise of options	6,700,000	14,400,000	2,100,000
Unrecognized compensation costs related to nonvested options	$ 0
Stock Options [Member] \| First Portion [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	20.00%
Stock Options [Member] \| Second Portion [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	50.00%
Stock Options [Member] \| Third Portion [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	100.00%
Restricted Stock [Member] \| Long Term Incentive Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 11,300,000	$ 12,200,000	$ 10,000,000
Shares granted	310,000
Compensation costs not yet recognized, period for recognition	1 year 12 days
Long Term Incentive Shares
Granted (USD per share)	$ 39.93	$ 32.48	$ 35.14
Total unrecognized compensation cost related to nonvested shares	$ 7,600,000
Total fair value of restricted shares vested	$ 11,700,000	$ 9,000,000	$ 7,400,000
Restricted Stock [Member] \| Long Term Incentive Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock [Member] \| Long Term Incentive Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) [Member] \| Second Portion [Member] \| 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Bonus Shares [Member] \| Bonus Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 2,000,000	$ 4,700,000	$ 3,900,000
Shares granted	51,416	140,376	111,700
Bonus Shares [Member] \| Bonus Shares [Member] \| Minimum [Member]
Bonus Shares and Plans
Percent of bonuses taken in cash	100.00%
Bonus Shares [Member] \| Bonus Shares [Member] \| Maximum [Member]
Bonus Shares and Plans
Percent of bonuses taken in cash	120.00%
Salaries, Wages and Officers' Compensation	$ 50,000
Performance Shares [Member] \| Profit Sharing Plan [Member]
Bonus Shares and Plans
Maximum percent of salary contributed	5.00%
Profit sharing plan expense	$ 730,000	$ 669,000	$ 965,000
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| 2008 plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	272.00%
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2015 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation		174.00%
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2014 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation			110.00%
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2017 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	132.00%
Executives Other [Member] \| Restricted Stock Units (RSUs) [Member] \| 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Executives Other [Member] \| Restricted Stock Units (RSUs) [Member] \| 2008 plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	200.00%
Executives Other [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2015 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation		136.00%
Executives Other [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2014 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation			90.00%
Executives Other [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2017 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	105.00%
Chief Financial Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2008 plan [Member] \| 2016 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	160.00%
Chief Financial Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| First Portion [Member] \| 2016 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Chief Financial Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Second Portion [Member] \| 2017 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Chief Financial Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Second Portion [Member] \| 2016 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years