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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Interest Expense    
Derivative Instruments and Hedging Activities Disclosures    
Amount expected to be transferred in the next 12 months   $ 1.1
Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures    
Notional amount   $ 200.0
Derivative instrument, underlying rate (percentage)   1.85%
Derivative instrument, effective rate (percentage)   3.05%
LIBOR | Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures    
Derivative instrument, variable rate (percentage)   1.20%
Term Loan    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument face amount   $ 200.0
Loans Payable    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, maturity years 3 years  
Loans Payable | LIBOR | Minimum    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument, variable rate on spread 1.20%  
Loans Payable | LIBOR | Maximum    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument, variable rate on spread 1.90%