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Common Stock Aggregate Offering Price, Remaining

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Common Stock Shares Authorized Remaining

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Fees And Commissions At Market Equity Offering Program Sales Agent

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Share based compensation arrangement by share based payment award equity instruments other than options grants in period intrinsic value.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number Of Measurement Periods

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Stock Transferred During Period, Deposit To Deferred Compensation Plan

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

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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The cash inflow from the additional capital contribution to the entity.

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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 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).

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

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Stockholders' Equity - Narrative (Details)		12 Months Ended			131 Months Ended
Stockholders' Equity - Narrative (Details)	May 05, 2020 $ / shares shares	Dec. 31, 2020 USD ($) measurement_period $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) measurement_period $ / shares shares	Apr. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, authorized (in shares)		400,000,000	400,000,000		400,000,000
Common stock, par value (in dollars per share) \| $ / shares		$ 0.01	$ 0.01		$ 0.01
Preferred stock, authorized (in shares)		100,000,000			100,000,000
Preferred stock, par value (in dollars per share) \| $ / shares		$ 0.01			$ 0.01
Common stock aggregate offering price, remaining \| $		$ 84,100,000
Issuance of common stock, net of issuance costs (in shares)			6,064,576
Net proceeds of common share issuance \| $		64,767,000	$ 278,058,000	$ 208,949,000
Total compensation to the applicable sales agents \| $		$ 900,000	$ 4,000,000.0
Shares repurchase program, authorized repurchase amount (in shares)		3,000,000			3,000,000
Number of measurement periods \| measurement_period		3			3
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock, net of issuance costs (in shares)		1,344,281	6,271,863	5,698,326
Deposits to deferred compensation plan (in shares)		139,224
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining balance of shares available (in shares)		1,376,906			1,376,906	1,510,079
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock, net of issuance costs (in shares)		135,494
Price per share of common stock (in dollars per share) \| $ / shares		$ 54.22
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining balance of shares available (in shares)						388,882
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted common stock granted (in shares)		78,041	111,099	53,915
Grant date fair value (in dollars per share) \| $ / shares		$ 60.11	$ 46.99	$ 34.63
Compensation costs \| $		$ 2,600,000	$ 1,900,000	$ 1,900,000
Fair value of restricted stock granted \| $		4,700,000
Unrecognized compensation costs \| $		$ 7,900,000			$ 7,900,000
Weighted average period of recognition		3 years 8 months 12 days
Restricted stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares					$ 14.20
Vesting period for restricted stock		3 years
Restricted stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares					60.83
Vesting period for restricted stock		5 years
Restricted stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted common stock granted (in shares)	11,190
Grant date fair value (in dollars per share) \| $ / shares	$ 53.62
Compensation costs \| $		$ 600,000
Restricted stock \| 2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of stock that may be issued (in shares)						1,898,961
Performance Shares \| Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs \| $		3,138,000	6,425,000	$ 7,063,000
$300 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price \| $		$ 300,000,000
Issuance of common stock, net of issuance costs (in shares)		1,197,597
Weighted average offering price per share (in dollars per share) \| $ / shares		$ 54.08			$ 54.08
Net proceeds of common share issuance \| $		$ 63,800,000
$250 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price \| $		$ 250,000,000	$ 250,000,000.0
Weighted average offering price per share (in dollars per share) \| $ / shares			$ 45.85
$200 & $250 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net proceeds of common share issuance \| $			$ 274,000,000.0