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Share based compensation arrangement by share based payment award grant month and year.

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The cash outflow to reacquire common stock during the period.

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Number of shares authorized for issuance under share-based payment arrangement.

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Common Shares and Share-based Compensation - Additional Information (Details) - USD ($)			12 Months Ended			63 Months Ended
	Apr. 15, 2020	Mar. 30, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2018	Feb. 29, 2020	Oct. 31, 2018	May 31, 2014	Oct. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Repurchase of common stock			$ 5,500,000	$ 10,000,000	$ 5,850,000
Share-based compensation expense recognized			23,119,000	9,340,000	7,714,000
Unrecognized stock-based compensation expense			$ 18,000,000.0
Unrecognized stock-based compensation expense, weighted-average recognition period			11 months 15 days
Restricted Stock Units and Deferred Stock Units \| Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized			$ 1,000,000.0	$ 900,000	$ 500,000
Special One-time Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award grant month and year			2020-04
Share-based compensation award grant, fair value	$ 14,400,000
Share-based compensation award expected to vest month and year			2021-02
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of outstanding shares			162,000	187,000
Amended and Restated 2010 Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares to be issued									4,398,613
Incentive plan and award expiration date			Apr. 09, 2024
Shares available for future issuance			535,361
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units and Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of stock units vested			$ 10,400,000
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units (RSUs) \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units (RSUs) \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			5 years
Amended and Restated 2010 Incentive Plan \| EPS Performance-based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Amended and Restated 2010 Incentive Plan \| EPS Performance-based Restricted Stock Units \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares			0.00%
Amended and Restated 2010 Incentive Plan \| EPS Performance-based Restricted Stock Units \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares			200.00%
Amended and Restated 2010 Incentive Plan \| TSR Performance-based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Amended and Restated 2010 Incentive Plan \| TSR Performance-based Restricted Stock Units \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares			0.00%
Amended and Restated 2010 Incentive Plan \| TSR Performance-based Restricted Stock Units \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares			200.00%
Amended and Restated 2010 Incentive Plan \| Performance Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of stock units vested			$ 10,800,000
Range of percentage of shares to be issued upon settlement following vesting of target number of shares			200.00%
Amended and Restated 2010 Incentive Plan \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Stock options, Granted		193,000	0
Stock options, Expiration Period		10 years
Intrinsic value of stock options exercised			$ 1,000,000.0
Cash received from exercise of stock options			200,000
Income tax deductions from stock options exercised			$ 0
2013 Repurchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase program authorized amount										$ 10,000,000.0
Shares repurchased					89,000	385,000
Repurchase of common stock					$ 5,900,000	$ 10,000,000.0
Shares repurchased, average cost per share					$ 65.43	$ 25.97
2018 Repurchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase program authorized amount								$ 25,000,000.0
Shares repurchased			65,000	119,000
Repurchase of common stock			$ 5,500,000	$ 10,000,000.0
Shares repurchased, average cost per share			$ 84.55	$ 83.71
Available for share repurchases			$ 9,500,000
2020 Repurchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase program authorized amount							$ 50,000,000.0
2018 and 2020 Repurchase Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Available for share repurchases			$ 59,500,000