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Financial Instruments and Fair Value Measurements - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Prepaid expenses and other current assets $ 0 $ 444
Other assets 1,006 13,132
Total 1,006 13,576
Accrued expenses and other current liabilities 748 115
Other liabilities 7,294 1,696
Total $ 8,042 $ 1,811