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Derivatives and Financial Instruments - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]      
Derivative loss deferred in equity   $ 800,000 $ 400,000
Derivative (loss) gain transferred to consolidated income statement $ 200,000    
Long-term debt outstanding 109,200,000 109,200,000 77,100,000
Debt issuance costs 1,200,000 1,200,000 1,400,000
Variable interest rate debt 28,200,000 28,200,000 0
Accounts and Other Receivables      
Derivative [Line Items]      
Derivative financial assets 200,000 200,000 100,000
Other Current Liabilities      
Derivative [Line Items]      
Derivative financial liabilities 300,000 300,000 0
Bank and other loans      
Derivative [Line Items]      
Long-term debt outstanding $ 103,200,000 $ 103,200,000 $ 75,000,000