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Restricted Shares Granted Annually

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

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

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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

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Stock Compensation Plans - Narrative (Details)	1 Months Ended	12 Months Ended
Stock Compensation Plans - Narrative (Details)	May 31, 2018 shares	Dec. 31, 2020 USD ($) plan installment $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan		2
Total intrinsic value of stock options exercised \| $		$ 4,200,000	$ 3,400,000	$ 7,500,000
Fair value of stock options vested \| $		800,000	5,100,000	3,700,000
Allocated share-based compensation expense \| $		8,300,000	$ 11,100,000	$ 7,600,000
Unrecognized stock-based compensation expense \| $		$ 13,600,000
Weighted average, expected recognition period		1 year 10 months 24 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) \| shares		155,048	486,682
Restricted Time Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments \| installment		3
Restricted Performance Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years		3 years
Restricted Performance Based Stock Units \| Black-Scholes Option Valuation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) \| $ / shares		$ 80.38	$ 66.16
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) \| $ / shares		$ 65.36
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards (in shares) \| shares		1,781,546
Options outstanding (in shares) \| shares		17,150
Exercise price, upper range (usd per share) \| $ / shares		$ 57.54
Expiration period, years		7 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards (in shares) \| shares	2,974,543				1,974,543
Expiration period, years		7 years
Number of additional shares authorized (in shares) \| shares	1,000,000
2014 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) \| shares		137,898
Exercise price, upper range (usd per share) \| $ / shares		$ 61.30
Exercise price, lower range (usd per share) \| $ / shares		$ 33.05
Vesting period, years		3 years
2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards (in shares) \| shares	891,960
Director's Plan, Per Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares granted upon election \| $		$ 100,000
Restricted shares granted based on percent of director compensation		10000000.00%
Director's Plan, Per Director \| Restricted Stock \| Board of Directors Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted annually \| $		$ 50,000
Director's Plan, Per Director \| Restricted Stock \| Lead Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted annually \| $		$ 40,000