Share-Based Employee Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017 USD ($) plan $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)
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	$ 3,185	$ 2,052
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted \| shares	0	0
Compensation expense related to stock options	$ 8	$ 121
Total unrecognized compensation expense related to non-vested shares granted	$ 39
Number of years compensation expense to be recognized over	1 year 2 months 5 days
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	$ 10,285
Number of years compensation expense to be recognized over	2 years 7 months 27 days
Number of stock units granted \| shares	465,000	493,000
Stock units, weighted average grant-date fair value (usd per share) \| $ / shares	$ 10.13	$ 8.61
Compensation expense related to restricted stocks	$ 1,221	$ 1,040
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	$ 9,167
Number of years compensation expense to be recognized over	1 year 9 months 14 days
Number of stock units granted \| shares	370,000	420,000
Stock units, weighted average grant-date fair value (usd per share) \| $ / shares	$ 10.10	$ 8.61
Award requisite service period	3 years	3 years
Cost (reversal) of employee share-based compensation included in income, before income tax	$ 1,988	$ 1,033
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%
Stock Appreciation Rights (SARs)
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
Number of stock units granted \| shares	0	0
Cost (reversal) of employee share-based compensation included in income, before income tax	$ (32)	$ (143)
Accrued compensation expense	$ 0		$ 224

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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Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent

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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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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.

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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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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 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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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 share options (or share units) granted during the period.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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