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Investments - Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Number of securities, less than 12 months | security 41 34
Fair value, less than 12 months $ 117,933 $ 81,408
Unrealized losses, less than 12 months $ (2,601) $ (667)
Number of securities,12 months or greater | security 14 37
Fair value, 12 months or greater $ 47,828 $ 137,432
Unrealized losses, 12 months or greater $ (450) $ (1,689)
Number of securities, total | security 55 71
Fair value $ 165,761 $ 218,840
Unrealized Losses $ (3,051) $ (2,356)
U.S. Treasury securities and obligations of U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities, less than 12 months | security 2 4
Fair value, less than 12 months $ 12,740 $ 7,228
Unrealized losses, less than 12 months $ (57) $ (33)
Number of securities,12 months or greater | security 4 10
Fair value, 12 months or greater $ 19,990 $ 49,884
Unrealized losses, 12 months or greater $ (49) $ (540)
Number of securities, total | security 6 14
Fair value $ 32,730 $ 57,112
Unrealized Losses $ (106) $ (573)
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities, less than 12 months | security 0 1
Fair value, less than 12 months $ 0 $ 3,232
Unrealized losses, less than 12 months $ 0 $ (18)
Number of securities,12 months or greater | security 2 1
Fair value, 12 months or greater $ 4,976 $ 1,695
Unrealized losses, 12 months or greater $ (24) $ (55)
Number of securities, total | security 2 2
Fair value $ 4,976 $ 4,927
Unrealized Losses $ (24) $ (73)
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities, less than 12 months | security 34 26
Fair value, less than 12 months $ 96,420 $ 60,334
Unrealized losses, less than 12 months $ (2,473) $ (559)
Number of securities,12 months or greater | security 5 22
Fair value, 12 months or greater $ 13,589 $ 65,806
Unrealized losses, 12 months or greater $ (320) $ (897)
Number of securities, total | security 39 48
Fair value $ 110,009 $ 126,140
Unrealized Losses $ (2,793) $ (1,456)
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities, less than 12 months | security 5 3
Fair value, less than 12 months $ 8,773 $ 10,614
Unrealized losses, less than 12 months $ (71) $ (57)
Number of securities,12 months or greater | security 3 4
Fair value, 12 months or greater $ 9,273 $ 20,047
Unrealized losses, 12 months or greater $ (57) $ (197)
Number of securities, total | security 8 7
Fair value $ 18,046 $ 30,661
Unrealized Losses $ (128) $ (254)