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Derivatives and Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative loss deferred in equity	$ 600,000	$ 400,000
Derivative (loss) gain transferred to consolidated income statement	200,000
Long-term debt outstanding	92,600,000	77,100,000
Debt issuance costs	1,300,000	1,400,000
Variable interest rate debt	11,300,000	0
Accounts and Other Receivables
Derivative [Line Items]
Derivative financial assets	300,000	100,000
Other Current Liabilities
Derivative [Line Items]
Derivative financial liabilities	200,000	0
Bank and other loans
Derivative [Line Items]
Long-term debt outstanding	$ 86,300,000	$ 75,000,000

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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