Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Fair Value Measurements - Schedule of Fair Value Measured On Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair value measurements    
Interest rate swap agreements - assets $ 10,552 $ 7,058
Interest rate swap agreements - liabilities (6,039) (13,817)
Total 4,513 (6,759)
Level 1    
Fair value measurements    
Interest rate swap agreements - assets 0 0
Interest rate swap agreements - liabilities 0 0
Total 0 0
Level 2    
Fair value measurements    
Interest rate swap agreements - assets 10,552 7,058
Interest rate swap agreements - liabilities (6,039) (13,817)
Total 4,513 (6,759)
Level 3    
Fair value measurements    
Interest rate swap agreements - assets 0 0
Interest rate swap agreements - liabilities 0 0
Total $ 0 $ 0