Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.7.0.1
Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
 1 Months Ended
Dec. 31, 2016
Jun. 30, 2017
Apr. 30, 2017
Mar. 31, 2017
Level 2 input        
Volatility 20.20%      
Interest rate 1.30%      
Dividend yield 0.00%      
Zero-strike call option        
Assets and Liabilities Measured at Fair Value        
Derivative underlying share amount   600,242    
Derivative premium paid   $ (51,600)    
Derivative settlement proceeds   51,900   $ 50,000
Zero-strike call option | Call Option        
Assets and Liabilities Measured at Fair Value        
Derivative underlying share amount 704,908   600,242  
Derivative premium paid $ (47,900)   $ (50,000)  
Total        
Assets and Liabilities Measured at Fair Value        
Derivative Asset 49,019 51,086    
Total | Recurring        
Assets and Liabilities Measured at Fair Value        
Cash equivalents 198,011 189,606    
Quoted prices in active markets for identical assets (Level 1) | Recurring        
Assets and Liabilities Measured at Fair Value        
Cash equivalents 198,011 189,606    
Significant other observable inputs (Level 2)        
Assets and Liabilities Measured at Fair Value        
Derivative Asset $ 49,019 $ 51,086