Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.19.3
Assets and Liabilities Measured at Fair Value (Details)
$ in Thousands
 1 Months Ended
Sep. 30, 2019
USD ($)
shares
Aug. 31, 2018
USD ($)
shares
Apr. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Jun. 30, 2018
shares
Recurring          
Assets and Liabilities Measured at Fair Value          
Cash equivalents $ 36,459     $ 67,329  
Derivative Asset 45,897        
Quoted prices in active markets for identical assets (Level 1) | Recurring          
Assets and Liabilities Measured at Fair Value          
Cash equivalents 36,459     $ 67,329  
Significant other observable inputs (Level 2) | Recurring          
Assets and Liabilities Measured at Fair Value          
Derivative Asset $ 45,897        
Minimum | Significant other observable inputs (Level 2) | Volatility          
Level 2 input          
Derivative Measurement Input 22.0        
Minimum | Significant other observable inputs (Level 2) | Interest Rate          
Level 2 input          
Derivative Measurement Input 2.1        
Minimum | Significant other observable inputs (Level 2) | Dividend Yield          
Level 2 input          
Derivative Measurement Input 0        
Maximum | Significant other observable inputs (Level 2) | Volatility          
Level 2 input          
Derivative Measurement Input 22.0        
Maximum | Significant other observable inputs (Level 2) | Interest Rate          
Level 2 input          
Derivative Measurement Input 2.1        
Maximum | Significant other observable inputs (Level 2) | Dividend Yield          
Level 2 input          
Derivative Measurement Input 0        
Series C common stock | Zero-strike call option          
Assets and Liabilities Measured at Fair Value          
Derivative underlying share amount | shares 460,675 621,920 610,325   632,911
Derivative premium paid $ 46,300 $ 48,600 $ 47,800