Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Fair Value Measured On Recurring Basis (Details)

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Fair Value Measurements - Schedule of Fair Value Measured On Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - assets $ 6,027 $ 10,552
Interest rate swap agreements - liabilities (9,287) (6,039)
Total (3,260) 4,513
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - assets 0 0
Interest rate swap agreements - liabilities 0 0
Total 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - assets 6,027 10,552
Interest rate swap agreements - liabilities (9,287) (6,039)
Total (3,260) 4,513
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - assets 0 0
Interest rate swap agreements - liabilities 0 0
Total $ 0 $ 0