XML 54 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Unrealized Gains (Losses) On Marketable Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accumulated net unrealized gains (losses)    
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss) $ (81) $ (150)
Accumulated net unrealized gains, net of tax, in accumulated other comprehensive income (loss) (1,000) (1,000)
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 51 22
Unrealized Losses (132) (172)
Unrealized Gains Losses, Net (81) (150)
Contractual maturities of restricted and non-restricted marketable investment securities    
Debt securities with contractual maturities within one year 180,000  
Debt securities with contractual maturities extending longer than one year through and including five years 34,000  
U.S. Treasury and agency securities    
Accumulated net unrealized gains (losses)    
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss) 21 (119)
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 40 22
Unrealized Losses (19) (141)
Unrealized Gains Losses, Net 21 (119)
Commercial paper    
Accumulated net unrealized gains (losses)    
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss)   (2)
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Losses   (2)
Unrealized Gains Losses, Net   (2)
Corporate securities    
Accumulated net unrealized gains (losses)    
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss) (102) (29)
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 11  
Unrealized Losses (113) (29)
Unrealized Gains Losses, Net $ (102) $ (29)