Common Stock Aggregate Offering Price

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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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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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- Definition

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

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

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

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- Definition

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 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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Stockholders' Equity - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
Stockholders' Equity - Narrative (Details) - USD ($)	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		400,000,000		400,000,000		400,000,000
Common stock, par value (in dollars per share)		$ 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)		$ 0.01		$ 0.01
Net proceeds of common share issuance				$ 264,493,000	$ 135,879,000
Shares repurchase program, authorized repurchase amount (in shares)		3,000,000		3,000,000
Repurchased shares of stock pursuant to share repurchase authorization (in shares)				0
Common stock, shares issued (in shares)	11,200	67,012,010		67,012,010		61,013,711
Grant date fair value per share (in dollars per share)	$ 44.65
Compensation costs		$ 500,000		$ 500,000
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	1,898,961	1,898,961		1,898,961
Remaining balance of shares available (in shares)	1,510,079	1,459,893		1,459,893
Amended and Restated 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining balance of shares available (in shares)	388,882
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)				196,087
Weighted average offering price per share (in dollars per share)				$ 36.55
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs		$ 400,000	$ 500,000	$ 1,300,000	1,400,000
Grant date fair value per share of restricted stock awards (in dollars per share)				$ 46.99
Fair value of the restricted stock granted				$ 5,200,000
Vesting period for the restricted stock				5 years
Unrecognized compensation costs related to restricted stock issuances		$ 6,700,000		$ 6,700,000
Remaining weighted average period				3 years 10 months 24 days
Minimum \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share of restricted stock awards (in dollars per share)				$ 14.20
Maximum \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share of restricted stock awards (in dollars per share)				$ 50.10
$300 Million ATM Program
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				$ 162,600,000
Issuance of common stock, net of issuance costs (in shares)		1,458,630
Shares issued, price per share (in dollars per share)		$ 50.28		$ 50.28
$250 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price					$ 250,000,000
Issuance of common stock, net of issuance costs (in shares)			729,667	5,822,701
Shares issued, price per share (in dollars per share)		$ 45.40	$ 38.22	$ 45.40	$ 38.22
$200 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock aggregate offering price					$ 200,000,000
Issuance of common stock, net of issuance costs (in shares)					3,615,068
Shares issued, price per share (in dollars per share)			$ 37.59		$ 37.59
$300 Million & $250 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net proceeds of common share issuance		$ 72,300,000		$ 260,500,000
Total compensation to the applicable sales agents		$ 1,100,000		$ 3,800,000
$250 Million & $200 Million ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net proceeds of common share issuance			$ 27,500,000		$ 133,900,000
Total compensation to the applicable sales agents			$ 400,000		$ 2,000,000.0