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Financial Instruments and Fair Value Measurements - Derivatives Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2019
GBP (£)
derivative
May 31, 2019
USD ($)
derivative
Interest rate swaps        
Derivative [Line Items]        
Interest rate swap unrealized loss expected to be reclassified within next twelve months $ 5,700 $ 5,700    
Interest rate swaps | Interest expense        
Derivative [Line Items]        
Unrealized gains (losses) reclassified to income statement (890) (2,000)    
Interest rate swaps | Foreign exchange gains        
Derivative [Line Items]        
Unrealized gains (losses) reclassified to income statement 5,700 7,100    
Cross-currency swaps        
Derivative [Line Items]        
Cross-currency swap unrealized gains expected to be reclassified within next twelve months $ 1,900 $ 1,900    
Cross-currency swaps | Cash flow hedge        
Derivative [Line Items]        
Number of derivative instruments | derivative     4 4
Swap exchange notional amount     £ 130 $ 166,000