Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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 under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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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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Stock-Based Compensation - Non-Vested Common Stock Grants (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares			99,181
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Less: Vested shares			131,613
Less: Vested (fair value)			$ 19.22
Granted shares	843	88,392	133,421	174,602
Granted (fair value)	$ (12.82)	$ (20.44)	$ (16.26)	$ (20.07)
Outstanding shares	213,685		213,685		217,936
Outstanding (fair value)	$ 17.51		$ 17.51		$ 18.96
Less: Forfeited shares			6,059
Less: Forfeited (fair value)			$ 20.15
Contingent Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares			45,000
Granted (fair value)	$ (15.70)
Restricted Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares			99,181	29,464
Granted (Weighted-Average Grant Date)			$ 5.96	$ 8.01