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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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Preferred Stock Redemption, Write-off Of Original Issuance, Expense

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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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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 to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The percentage rate used to calculate dividend payments on preferred stock.

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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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Per share amount of cumulative preferred dividends in arrears.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control 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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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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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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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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Number of shares that have been repurchased during the period and are being held in treasury.

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Stockholders' Equity - Narrative (Details)			12 Months Ended			119 Months Ended
Stockholders' Equity - Narrative (Details)	Apr. 30, 2019 $ / shares shares	Jul. 19, 2017 $ / shares shares	Dec. 31, 2019 USD ($) measurement_period $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) measurement_period $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, authorized (in shares) \| 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) \| shares			100,000,000			100,000,000
Preferred stock, par value (in dollars per share) \| $ / shares			$ 0.01			$ 0.01
Number of measurement periods \| measurement_period			3			3
Net proceeds of common share issuance			$ 278,058,000	$ 208,949,000	$ 255,295,000
Shares repurchase program, authorized repurchase amount (in shares) \| shares			3,000,000			3,000,000
Repurchased shares of stock pursuant to share repurchase authorization (in shares) \| shares			0
Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, shares outstanding (in shares) \| shares		1,840,000
Dividend rate		7.75%
Redemption price of Series A Preferred Stock (in dollars per share) \| $ / shares		$ 25.00
Accrued and unpaid dividends (in dollars per share) \| $ / shares		$ 0.096875
Write-off of original issuance costs related to the redemption of the Series A Preferred Stock					$ 1,800,000
2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs			$ 500,000
Unrestricted Stock [Member] \| 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted common stock granted (in shares) \| shares	11,200
Grant date fair value (in dollars per share) \| $ / shares	$ 44.65
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted common stock granted (in shares) \| shares			111,099	53,915	32,247
Grant date fair value (in dollars per share) \| $ / shares			$ 46.99	$ 34.63	$ 26.52
Compensation costs			$ 1,900,000	$ 1,900,000	$ 1,700,000
Fair value of the restricted stock granted			$ 5,200,000
Vesting period for the restricted stock			5 years
Total unrecognized compensation costs related to restricted stock issuances			$ 6,100,000			$ 6,100,000
Remaining weighted average period			3 years 9 months 18 days
Restricted stock [Member] \| 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, authorized (in shares) \| shares	1,898,961
Remaining balance of shares available (in shares) \| shares	1,510,079		1,460,991			1,460,991
Restricted stock [Member] \| Amended and Restated 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining balance of shares available (in shares) \| shares	388,882
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs			$ 6,425,000	7,063,000	$ 6,715,000
Performance Shares [Member] \| Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock, net of issuance costs (in shares) \| shares			196,087
Weighted average offering price per share (in dollars per share) \| $ / shares			$ 36.55			$ 36.55
Minimum [Member] \| Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares						14.20
Maximum [Member] \| Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares						50.10
$300 Million ATM Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price			$ 300,000,000
Common stock aggregate offering price, remaining			$ 148,900,000
Issuance of common stock, net of issuance costs (in shares) \| shares			6,064,576
Weighted average offering price per share (in dollars per share) \| $ / shares			$ 45.85			$ 45.85
$250 Million ATM Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price			$ 250,000,000
Common stock aggregate offering price, remaining				129,900,000
$200 Million ATM Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price				$ 200,000,000.0
$250 & $300 Million ATM Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net proceeds of common share issuance			274,000,000.0
Total compensation to the applicable sales agents			$ 4,000,000.0
$200 & $250 Million ATM Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock, net of issuance costs (in shares) \| shares				5,492,707
Weighted average offering price per share (in dollars per share) \| $ / shares				$ 38.04
Net proceeds of common share issuance				$ 205,900,000
Total compensation to the applicable sales agents				$ 3,000,000.0