Stock-Based Compensation (Narrative) (Details)	6 Months Ended
Jun. 30, 2020 USD ($) item $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| item	4
Unrecognized compensation cost related to unvested awards under share-based plans \| $	$ 15,600,000
Cost expected to be recognized over a weighted average period	2 years 4 months 24 days
Share-based Payment Arrangement, Expense \| $	$ 3,000,000.0	$ 3,000,000.0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	1,531,702	930,831
Granted (in dollars per share) \| $ / shares	$ 6.87
Options Granted (in dollars per share) \| $ / shares		$ 8.57
Restricted Stock Units (RSUs) [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years
Granted (in shares) \| shares	1,387,602	863,331
Restricted Stock Units (RSUs) [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year	1 year
Granted (in shares) \| shares	144,100	67,500
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares) \| shares	300,000	65,104
Vesting period	4 years
Stock option exercised (in shares) \| shares	74,000	0
Total intrinsic value of options exercised \| $	$ 310,280
Options Granted (in dollars per share) \| $ / shares	$ 3.02	$ 3.84
Options exercised and vested in period, total intrinsic value \| $	$ 6,200,000	$ 4,000,000.0
Restricted Stock Units And Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value \| $	$ 5,000,000.0	$ 3,500,000

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Share Based Compensation Arrangement By Share Based Payment Award Options Exercises And Vested In Period Total Intrinsic Value

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

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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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Amount of cost to be recognized for option under share-based payment arrangement.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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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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Number of share options (or share units) exercised during the current period.

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