Quarterly report pursuant to Section 13 or 15(d)

Investments (Schedule Of Held-To-Maturity Securities) (Details)

v3.10.0.1
Investments (Schedule Of Held-To-Maturity Securities) (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Schedule of Held-to-maturity Securities [Line Items]  
Estimated Fair Value $ 42,433
Estimated Fair Value 42,433
Corporate Bonds [Member]  
Schedule of Held-to-maturity Securities [Line Items]  
Estimated Fair Value 27,502
Estimated Fair Value 27,502
U.S. Treasuries [Member]  
Schedule of Held-to-maturity Securities [Line Items]  
Estimated Fair Value 14,931
Estimated Fair Value $ 14,931