Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Additional Information (Details)

v3.10.0.1
Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Swap    
Derivative [Line Items]    
Derivative, Fair Value, Net   $ 400,000
Rate | Designated as Hedging Instrument | Interest Rate Swap December 2016    
Derivative [Line Items]    
Derivative, Notional Amount $ 50,000,000,000,000 $ 50,000,000,000,000
Rate 1.59% 1.59%
Rate | Designated as Hedging Instrument | Interest Rate Swap June 2018    
Derivative [Line Items]    
Derivative, Notional Amount $ 20,000,000,000,000 $ 20,000,000,000,000
Rate 2.98% 2.98%
Rate | Designated as Hedging Instrument | Interest Rate Swap    
Derivative [Line Items]    
Derivative, Notional Amount, Increase At Maturity $ 70,000,000  
Other Noncurrent Assets | Interest Rate Swap    
Derivative [Line Items]    
Derivative, Fair Value, Net 500,000  
Other Noncurrent Liabilities | Interest Rate Swap    
Derivative [Line Items]    
Derivative, Fair Value, Net $ 900,000