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Debt - Effect of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flow Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of gain recognized in accumulated comprehensive income   $ 1,183 $ 623
Cash Flow Hedging | Interest expense, net      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of gain (loss) reclassified from accumulated comprehensive income into net income   (423) (1,295)
Effects of cash flow hedges   $ 30,155 $ 44,135
Interest Rate Swap      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of gain recognized in accumulated comprehensive income $ 923    
Interest Rate Swap | Interest expense, net      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of gain (loss) reclassified from accumulated comprehensive income into net income 956    
Effects of cash flow hedges $ 24,943