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

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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 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

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

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No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 25
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- Definition

Amount of cost for defined contribution plan.

+ References

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

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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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://fasb.org/us-gaap/role/ref/legacyRef
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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

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

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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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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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No definition available.

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- Definition

Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

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No definition available.

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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, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common share options granted (in shares)				0	0	0
Exercises in period, intrinsic value \| $				$ 106	$ 271	$ 26
Shares held in employee trust (in shares)				130,863	130,863
Initial vesting percentage				25.00%
Vesting percentage				100.00%
Vesting period (in years)				4 years
Cost recognized \| $				$ 393	$ 403	397
Allocated share-based compensation expense \| $				$ 6,185	$ 5,831	$ 6,302
Options 2010
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common share options granted (in shares)	1,248,501
Common share options exercise price (usd per share) \| $ / shares	$ 7.95
Expiration period after termination (in months)	6 months
Recognized compensation expense average period (in years)				5 years
Options 2010 \| Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 \| Share-based Payment Arrangement, Tranche Two
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 \| Share-based Payment Arrangement, Tranche Three
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 \| Share-based Compensation Award, Tranche Four
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 \| Share-based Compensation Award, Tranche Five
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common share options granted (in shares)		1,265,500
Common share options exercise price (usd per share) \| $ / shares		$ 6.39
Expiration period after termination (in months)		6 months
Recognized compensation expense average period (in years)				5 years
Options 2009 \| Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 \| Share-based Payment Arrangement, Tranche Two
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 \| Share-based Payment Arrangement, Tranche Three
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 \| Share-based Compensation Award, Tranche Four
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 \| Share-based Compensation Award, Tranche Five
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2008
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common share options granted (in 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 share) \| $ / shares			$ 4.97
Recognized compensation expense average period (in years)				3 years 7 months 6 days
Options 2008 \| Minimum
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			8.00
Options 2008 \| Maximum
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			$ 10.00
Options 2008 \| Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Award vesting rights, percentage			50.00%
Non-Management Award Grant
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares issued for services (in shares)				47,130	67,226	66,318
Shares issued for services, value \| $				$ 500	$ 595	$ 599
Non-vested Shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares issued for services (in shares)				243,270	277,460
Shares issued for services, value \| $				$ 2,581	$ 2,270
Non-options, nonvested, number (in shares)				2,704,729	2,941,412	3,455,077
Number of shares available for grant (in shares)				2,359,683
Compensation cost not yet recognized \| $				$ 6,122
Total compensation cost not yet recognized, period for recognition (in years)				1 year 7 months 6 days
Shares Subject to Time
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,024,584
Shares Subject to Performance
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,680,145