Number of independent directors.

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Period within which business combination is to be completed from IPO, , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total 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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Net number of non-option equity instruments granted to participants adjusted for the effect of stock dividends.

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Number of equity instruments other than options outstanding held by each awardee.

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Number of shares based awards subject to forfeiture when certain conditions are not met.

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Percentage of forfeiture rate of share based awards when certain conditions are not met.

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Minimum per share amount of stock trading to be met as condition for vesting of share based awards.

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The number of days within which period of trading the minimum per share amount of stock trading to be met as condition for vesting of share based awards.

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Period within which the number of days of trading the minimum per share amount of stock trading is to be met as a condition for vesting of share based awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of performance conditions that are to be met to vest share based awards.

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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 nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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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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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Stock Compensation - Narrative (Details)		1 Months Ended	12 Months Ended
Stock Compensation - Narrative (Details)	Jan. 31, 2014 USD ($) day condition director $ / shares shares	Feb. 28, 2014 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Jun. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized to grant (in shares)						500,000
Issued under the ESPP (in shares)			168,673
Stock-based compensation expense \| $			$ 2,714,000	$ 2,897,000	$ 2,617,000
Number of independent directors \| director	3
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years	3 years
Unrecognized compensation costs for options \| $			$ 600,000
Period for compensation recognition			1 year 6 months
Stock appreciation rights (SAR)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Period for compensation recognition			2 years 2 months 12 days
Unrecognized compensation cost for shares \| $			$ 10,000.0
Shares transferred (in shares)			5,450	30,300
Outstanding shares (in shares)			83,875	105,925	75,625
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Period for compensation recognition			1 year 6 months
Unrecognized compensation cost for shares \| $			$ 2,600,000
Phantom stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Period for compensation recognition			2 years
Unrecognized compensation cost for shares \| $			$ 200,000
Director shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for compensation recognition			0 years
Unrecognized compensation cost for shares \| $			$ 0
Shares transferred (in shares)	20,125
Number shares transferred, as adjusted for the effect of dividends (in shares)		60,375
Number of shares held by each director (in shares)			18,375
Outstanding shares (in shares)			55,125
Number to performance conditions \| condition	2
Period within which business combination is to be completed from IPO	21 months
Percentage of forfeitable shares under certain conditions	25.00%
Forfeitable shares under certain conditions (in shares)	13,781
Minimum stock trading price (in dollars per share) \| $ / shares	$ 13
Number of days of trading period of the minimum trading price \| day	20,000
Period of trading period of the minimum stock trading price	30 days
Aggregate fair value \| $	$ 400,000
2015 Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized to grant (in shares)			7,150,000
Available for grant (in shares)			3,974,757
Stock-based compensation expense \| $			$ 2,700,000	$ 2,900,000	$ 2,600,000
Anniversary one \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			33.00%
Anniversary two \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			33.00%
Anniversary three \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			33.00%
Director \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year	1 year
Period for compensation recognition			4 months 24 days
Unrecognized compensation cost for shares \| $			$ 200,000