Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Jan. 30, 2017	Dec. 31, 2016	Feb. 08, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Weighted average remaining contractual term	6 years 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, granted		26,943
Equity Plan 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for granting						750,000
Shares available to be granted						723,965
Award description	The Company may issue shares of common stock or grant other equity-based awards pursuant to the 2016 Equity Plan. Stock-based awards granted to date generally are time-based, vest in equal installments on each anniversary of the grant date and range over a one- to five-year period of time, and, in the case of stock options, expire 10 years from the grant date. As part of the 2016 Equity Plan, a performance equity incentive award program, known as the "Long-term incentive plan" allows participating officers of the Company to earn incentive awards of performance share/restricted stock units if certain pre-determined targets are achieved at the end of a three-year performance cycle. Stock-based compensation expense based on the grant date fair value is recognized ratably over the requisite service period for all awards and reflects forfeitures as they occur.
Other than options, granted, fair value	$ 113	$ 122
Share price	$ 16.71
Equity Plan 2016 [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration	10 years
Equity Plan 2016 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Award description	Restricted stock units (RSUs) are similar to restricted stock, except the recipient does not receive the stock immediately, but instead receives it upon the terms and conditions of the Company's long-term incentive plans which are subject to performance milestones achieved at the end of a three-year period. Each RSU cliff vests at the end of the three-year period and entitles the recipient to receive one share of common stock on a specified issuance date. The recipient does not have any stockholder rights, including voting rights, with respect to the shares underlying awarded RSUs until the recipient becomes the holder of those shares.
Equity Plan 2016 [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award method used for valuation	Black-Scholes valuation model
Share price							$ 11.35
Options, granted, weighted average fair value	$ 10.99
Options, outstanding intrinsic value	$ 521
Options, exercised, intrinsic value	8	$ 2
Options, exercisable, intrinsic value	$ 232
Maximum [Member] \| Equity Plan 2016 [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Maximum [Member] \| Equity Plan 2016 [Member] \| Restricted Stock Units (RSUs) [Member] \| Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, granted			48,871	43,821
Minimum [Member] \| Equity Plan 2016 [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Minimum [Member] \| Equity Plan 2016 [Member] \| Restricted Stock Units (RSUs) [Member] \| Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, granted			12,214	10,953
Minimum [Member] \| Equity Plan 2016 [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price					$ 15.89