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Derivatives - Schedule of Foreign Exchange Contracts (Details) - Dec. 31, 2018
€ in Thousands, £ in Thousands
GBP (£)
EUR (€)
$ / €
$ / £
Maximum        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Forward exchange rate | $ / £       1.29
Foreign exchange collars | Minimum        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Exchange rate floor     1.06 1.45
Foreign exchange collars | Maximum        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Exchange rate cap     1.53 1.82
Foreign exchange contracts | Minimum        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Forward exchange rate     1.10 1.24
Foreign exchange contracts | Maximum        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Forward exchange rate | $ / €     1.38  
Designated Hedges | Foreign exchange collars        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount £ 39,881 € 84,549    
Designated Hedges | Foreign exchange contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount 88,313 431,874    
Non-Designated Hedges | Foreign exchange collars        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount 2,309 114    
Non-Designated Hedges | Foreign exchange contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount £ 26,257 € 14,944