Defined Contribution Plan, Vesting Period

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- Definition

Initial Vesting Percentage

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- Definition

Number Of Trading Period Days Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting

+ References

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- Definition

Options Converted To Common Shares Exercise Price

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options Convertible To Common Shares

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- Definition

Share Based Compensation Expense Average Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period After Termination

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Index Shares

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Peer Shares

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No definition available.

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- Definition

Stated Lower Amount Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Amount Triggering Vesting

+ References

No definition available.

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- Definition

Vesting Percentage

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920

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- Definition

Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.30)
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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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.

+ References

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Benefit Plans - Additional Information (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 31, 2010 $ / shares shares	Jan. 08, 2010 $ / shares shares	Dec. 31, 2008 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)				0	0	0
Recognized compensation expense \| $				$ 480	$ 1,038	$ 1,037
Exercises in period, intrinsic value \| $					$ 2,780	8,607
Options, exercisable, intrinsic value \| $				$ 1,277
Vesting period (in years)				5 years
Shares held in employee trust (in shares)				427,531	427,531
Initial vesting percentage				25.00%
Vesting percentage				100.00%
Vesting period (in years)				4 years
Cost recognized \| $				$ 333	$ 299	298
Allocated share-based compensation expense \| $				$ 8,201	$ 7,550	$ 7,145
Options 2010 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)	1,248,501
Common share options exercise price (usd per share) \| $ / shares	$ 7.95
Expiration period after termination (in months)				6 months
Deferred compensation equity \| $				$ 2,422
Recognized compensation expense average period (in years)				5 years
Options 2010 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2009 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)		1,265,500
Common share options exercise price (usd per share) \| $ / shares		$ 6.39
Expiration period after termination (in months)				6 months
Deferred compensation equity \| $				$ 2,771
Recognized compensation expense average period (in years)				5 years
Options 2009 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate		20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate	20.00%
Options 2008 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (shares)			2,000,000
Common share options exercise price (usd per share) \| $ / shares			$ 5.60
Number of trading period days (in days)			20 days
Options convertible to common shares			1.13
Options converted to common shares exercise price (usd per shares) \| $ / shares			$ 4.97
Deferred compensation equity \| $				$ 2,480
Recognized compensation expense average period (in years)				3 years 7 months 6 days
Options 2008 [Member] \| Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			8
Options 2008 [Member] \| Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			$ 10
Options 2008 [Member] \| Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting rate			50.00%
Performance Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Measurement period (in years)				3 years
Index shares (in shares)				321,018
Peer shares (in shares)				321,011
Number of shares granted (in shares)				170,650
Vesting period (in years)				3 years
Employee Stock Option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options exercise price (usd per share) \| $ / shares				$ 7.05	$ 7.05	$ 6.95	$ 6.44
Number of shares outstanding (in shares)				1,350,410	1,350,410	1,955,701	3,480,080
Non-vested Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation costs \| $				$ 13,707
Number of shares granted (in shares)				812,679
Non-options, nonvested, number (in shares)				2,369,350	1,970,385	2,521,046
Number of shares available for grant (in shares)				3,320,961
Total compensation cost not yet recognized, period for recognition (in years)				3 years 3 months 18 days
Shares Subject to Time [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,720,824
Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				648,526