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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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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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded 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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

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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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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No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation 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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Equity Incentive Plan - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended			12 Months Ended
	May 01, 2015	May 31, 2016	Jul. 31, 2015	Jul. 31, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	2,500,000
Number of shares authorized (in shares)					7,500,000
Share-based compensation expense					$ 0	$ 57	$ 132
Common shares available for future grant (in shares)					3,460,504
Restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					$ 8,900	6,900	9,600
Total unrecognized compensation costs					$ 14,300
Weighted-average period of recognition of unrecognized share-based compensation expense					2 years 4 months 24 days
Total fair value of shares vested					$ 7,700	$ 5,800	$ 14,000
Unvested restricted shares					700,325	649,447	540,885	731,459
2012 Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Restricted shares issued upon conversion of performance units (in shares)			838,934
2016 Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					$ 1,700	$ (900)	$ 3,400
Total unrecognized compensation costs					$ 4,300
Weighted-average period of recognition of unrecognized share-based compensation expense					2 years 6 months 12 days
Total fair value of shares vested						$ 6,700
President and Chief Executive Officer \| Restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ (500)
President and Chief Executive Officer \| Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ (2,300)