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Accumulated Other Comprehensive (Loss) Income - (Tables)
 9 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Summary of Changes in Accumulated Other Comprehensive (Loss) Income
Following is a summary of the changes in the balances of accumulated other comprehensive income (loss), which is presented net of tax, as of September 30, 2017:
 
Unrealized Gain and (Loss) on Available-for-Sale Securities
Accumulated other comprehensive income at December 31, 2016
$
2,507

Other comprehensive income before reclassifications
2,443

Amounts reclassified from accumulated other comprehensive loss
(6,141
)
Other comprehensive loss
(3,698
)
Accumulated other comprehensive loss at September 30, 2017
$
(1,191
)
Reclassification out of Accumulated Other Comprehensive (Loss) Income
Following is a summary of the tax effects allocated to other comprehensive (loss) income for the three months ended September 30, 2017 and 2016:
 
Three Months Ended September 30, 2017
 
Before-Tax Amount
 
Tax Benefit or (Expense)
 
Net-of-Tax Amount
Unrealized (loss) gain on investments:
 
 
 
 
 
Unrealized loss on available-for-sale investments
$
(683
)
 
$
263

 
$
(420
)
Unrealized gain on restricted investments
4

 
(2
)
 
2

Reclassification adjustment for loss included in earnings
104

 
(40
)
 
64

Reclassification adjustment for other-than-temporary impairment loss included in earnings
403

 
(296
)
 
107

Net unrealized loss
(172
)
 
(75
)
 
(247
)
Other comprehensive loss
$
(172
)
 
$
(75
)
 
$
(247
)
 
Three Months Ended September 30, 2016
 
Before-Tax Amount
 
Tax (Expense) or Benefit
 
Net-of-Tax Amount
Unrealized gain on investments:
 
 
 
 
 
Unrealized gain on available-for-sale investments
$
3,257

 
$
(1,253
)
 
$
2,004

Reclassification adjustment for gain included in earnings
(40
)
 
15

 
(25
)
Net unrealized gain
3,217

 
(1,238
)
 
1,979

Other comprehensive income
$
3,217

 
$
(1,238
)
 
$
1,979

Following is a summary of the tax effects allocated to other comprehensive (loss) income for the nine months ended September 30, 2017 and 2016:
 
Nine Months Ended September 30, 2017
 
Before-Tax Amount
 
Tax (Expense) or Benefit
 
Net-of-Tax Amount
Unrealized gain on investments:
 
 
 
 
 
Unrealized gain on available-for-sale investments
$
3,967

 
$
(1,526
)
 
$
2,441

Unrealized gain on restricted investments
4

 
(2
)
 
2

Reclassification adjustment for gain included in earnings
(10,757
)
 
4,143

 
(6,614
)
Reclassification adjustment for other-than-temporary impairment loss included in earnings
769

 
(296
)
 
473

Net unrealized loss
(6,017
)
 
2,319

 
(3,698
)
Other comprehensive loss
$
(6,017
)
 
$
2,319

 
$
(3,698
)

 
Nine Months Ended September 30, 2016
 
Before-Tax Amount
 
Tax (Expense) or Benefit
 
Net-of-Tax Amount
Unrealized gain on investments:
 
 
 
 
 
Unrealized gain on available-for-sale investments
$
3,259

 
$
(1,254
)
 
$
2,005

Reclassification adjustment for gain included in earnings
(40
)
 
15

 
(25
)
Net unrealized gain
3,219

 
(1,239
)
 
1,980

Other comprehensive income
$
3,219

 
$
(1,239
)
 
$
1,980