• Filing Date: 2018-05-10
  • Form Type: 10-Q
  • Description: Quarterly report
v3.8.0.1
Fair Value Measurements - Changes in Life Expectancy Used to Estimate Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Value $ 567,628 $ 567,492
Change in Value 0  
+6 Life Expectancy Months Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Value 477,884  
Change in Value (89,744)  
-6 Life Expectancy Months Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Value 662,728  
Change in Value $ 95,100