Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities [Abstract]
Gross Unrealized Loss	$ 1,300
Fair Value	46,346	$ 76,245
Amortized Cost	50,846
Gross Unrealized Gain	175
Gross Unrealized Loss	1,283
Fair Value	49,738
Fair Value
Amortized Cost		118,110
Gross Unrealized Gain		834
Gross Unrealized Loss		3,207
Fair Value		115,737
U.S. Treasury securities
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	9,926
Gross Unrealized Gain	0
Gross Unrealized Loss	25
Fair Value	9,901
Fair Value
Amortized Cost		9,892
Gross Unrealized Gain		0
Gross Unrealized Loss		22
Fair Value		9,870
Corporate debt securities
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	37,515
Gross Unrealized Gain	175
Gross Unrealized Loss	1,245
Fair Value	36,445
Fair Value
Amortized Cost		67,781
Gross Unrealized Gain		411
Gross Unrealized Loss		1,817
Fair Value		66,375
Debt Securities
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	47,441
Gross Unrealized Gain	175
Gross Unrealized Loss	1,270
Fair Value	46,346
Debt and equity securities
Fair Value
Amortized Cost		77,673
Gross Unrealized Gain		411
Gross Unrealized Loss		1,839
Fair Value		76,245
Preferred stock
Fair Value
Amortized Cost		35,955
Gross Unrealized Gain		423
Gross Unrealized Loss		1,355
Fair Value		35,023
Short-term bond
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	3,240
Gross Unrealized Gain	0
Gross Unrealized Loss	13
Fair Value	3,227
Fair Value
Amortized Cost		4,264
Gross Unrealized Gain		0
Gross Unrealized Loss		13
Fair Value		4,251
Money market funds
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	165
Gross Unrealized Gain	0
Gross Unrealized Loss	0
Fair Value	165
Fair Value
Amortized Cost		218
Gross Unrealized Gain		0
Gross Unrealized Loss		0
Fair Value		218
Restricted investments
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost	3,405
Gross Unrealized Gain	0
Gross Unrealized Loss	13
Fair Value	$ 3,392
Fair Value
Amortized Cost		4,482
Gross Unrealized Gain		0
Gross Unrealized Loss		13
Fair Value		$ 4,469

Available-For-Sale Debt Securities And Restricted Investments, Accumulated Gross Unrealized Gain, Before Tax

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Available-For-Sale Debt Securities And Restricted Investments, Accumulated Gross Unrealized Loss, Before Tax

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB
-Name Accounting Standards Codification
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