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Share-Based Employee Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) plan $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shareholder approved stock plans | plan			2
Cost (reversal) of employee share-based compensation included in income, before income tax	$ 3,512	$ 4,181	$ 9,975	$ 9,551
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to non-vested shares granted	10,398		$ 10,398
Number of years compensation expense to be recognized over			2 years 4 months 27 days
Number of stock units granted (in shares) | shares		155,000	420,000	680,000
Stock units, weighted average grant-date fair value (usd per share) | $ / shares		$ 12.93	$ 15.22	$ 10.94
Compensation expense related to restricted stocks	1,536	$ 1,430	$ 4,386	$ 4,090
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to non-vested shares granted	$ 12,085		$ 12,085
Number of years compensation expense to be recognized over			1 year 4 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Number of stock units granted (in shares) | shares	0	92,000	307,000	462,000
Stock units, weighted average grant-date fair value (usd per share) | $ / shares		$ 12.98	$ 14.80	$ 10.68
Award requisite service period			3 years		3 years	3 years
Cost (reversal) of employee share-based compensation included in income, before income tax	$ 1,975	$ 2,742	$ 5,575	$ 5,468
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period			1 year
Shares awarded as a percentage of granted			0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent			50.00%		50.00%	50.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period			3 years
Shares awarded as a percentage of granted			200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent			80.00%		80.00%	80.00%

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Number Of Shareholder Approved Stock Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Shares Awarded As a Percentage of Granted

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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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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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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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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 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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