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Investments - Fair Values and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 994,543	$ 924,987
Gross Unrealized Gains	24,074	1,987
Gross Unrealized Losses	(1,010)	(15,484)
Fair value of securities	1,017,607	911,490
U.S. Treasury securities and obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,193	48,171
Gross Unrealized Gains	688	35
Gross Unrealized Losses	(116)	(1,376)
Fair value of securities	48,765	46,830
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	91,650	92,014
Gross Unrealized Gains	1,497	206
Gross Unrealized Losses	(73)	(963)
Fair value of securities	93,074	91,257
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	634,188	554,079
Gross Unrealized Gains	18,569	847
Gross Unrealized Losses	(785)	(11,688)
Fair value of securities	651,972	543,238
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	168,251	171,990
Gross Unrealized Gains	3,216	792
Gross Unrealized Losses	(36)	(1,457)
Fair value of securities	171,431	171,325
Total bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	942,282	866,254
Gross Unrealized Gains	23,970	1,880
Gross Unrealized Losses	(1,010)	(15,484)
Fair value of securities	965,242	852,650
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,261	58,733
Gross Unrealized Gains	104	107
Gross Unrealized Losses	0	0
Fair value of securities	$ 52,365	$ 58,840

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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