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Long Term Debt (Narratives) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Mar. 31, 2018	Jan. 22, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Secured Debt		$ 60,795			$ 11,748
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Maturity of debt instrument in years and months		5 years
Debt Instrument, Payment Terms	the outstanding term loans amortized in equal quarterly installments equal to $0.4 million per quarter on such date and during each of the next three quarters thereafter. Beginning the quarter ending March 31, 2019, the term loans amortize in installments of $0.6 million per quarter, continuing for the next three quarters thereafter and $0.8 million per quarter thereafter, with a balloon payment at maturity.
Debt Instrument Quarterly Payment Current Year			$ 400
Debt Instrument Quarterly Payment Next Year			600
Debt Instrument Quarterly Payment Thereafter			$ 800
Limitation on pledges of capital stock of foreign subsidiaries		65.00%
Line of Credit Facility, Amount Outstanding				$ 11,900
Line of Credit Facility, Remaining Borrowing Capacity		$ 9,800
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Line of Credit Facility, Amount Outstanding	$ 4,800
Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Floor Interest Rate	4.25%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Description Of Variable Rate Basis	London Interbank Offered Rate (LIBOR) rate plus 6.25%
Basis Spread on Variable Rate	6.25%
Floor Interest Rate	1.25%
Term Loan [Member]
Debt Instrument [Line Items]
Secured Debt	$ 64,000
Interest Rate As Of Reporting Date		8.88%

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Amount of the required quarterly payments including both interest and principal payments for the current fiscal year.

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Amount of the required quarterly payments including both interest and principal payments for the current fiscal year.

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Amount of the required quarterly payments including both interest and principal payments thereafter.

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Limitation on pledges of capital stock of foreign subsidiaries.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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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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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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