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Securities Available for Sale (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The amortized cost, gross unrealized gains and losses, and fair value of securities available for sale as of September 30, 2017 and December 31, 2016, were as follows:
September 30, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Corporate debt securities
$
123,007

 
$
176

 
$
(30
)
 
$
123,153

Asset-backed securities related to Company-
sponsored securitization transactions (1)
33,293

 
24

 
(32
)
 
33,285

Certificates of deposit
25,920

 
—

 
—

 
25,920

Asset-backed securities
15,454

 
—

 
(3
)
 
15,451

Commercial paper
9,981

 
—

 
—

 
9,981

U.S. agency securities
5,000

 
1

 
—

 
5,001

U.S. Treasury securities
2,496

 
—

 
(4
)
 
2,492

Other securities
4,001

 
1

 
—

 
4,002

Total securities available for sale
$
219,152

 
$
202

 
$
(69
)
 
$
219,285

 
 
 
 
 
 
 
 
December 31, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Corporate debt securities
$
181,359

 
$
63

 
$
(199
)
 
$
181,223

Certificates of deposit
27,501

 
—

 
—

 
27,501

Asset-backed securities
25,369

 
4

 
(9
)
 
25,364

Commercial paper
20,164

 
—

 
—

 
20,164

U.S. agency securities
19,602

 
21

 
—

 
19,623

U.S. Treasury securities
2,493

 
3

 
—

 
2,496

Other securities
10,805

 
—

 
(39
)
 
10,766

Total securities available for sale
$
287,293

 
$
91

 
$
(247
)
 
$
287,137
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
A summary of securities available for sale with unrealized losses as of September 30, 2017 and December 31, 2016, aggregated by period of continuous unrealized loss, is as follows:
 
Less than
12 months
 
12 months
or longer
 
Total
September 30, 2017
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Corporate debt securities
$
37,291

 
$
(20
)
 
$
8,347

 
$
(10
)
 
$
45,638

 
$
(30
)
Asset-backed securities related to Company-sponsored securitization transactions
19,187

 
(32
)
 
—

 
—

 
19,187

 
(32
)
Asset-backed securities
4,233

 
(3
)
 
—

 
—

 
4,233

 
(3
)
U.S. Treasury securities
2,492

 
(4
)
 
—

 
—

 
2,492

 
(4
)
Total securities with unrealized losses(1)
$
63,203

 
$
(59
)
 
$
8,347

 
$
(10
)
 
$
71,550

 
$
(69
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Less than
12 months
 
12 months
or longer
 
Total
December 31, 2016
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Corporate debt securities
$
107,862

 
$
(185
)
 
$
11,682

 
$
(14
)
 
$
119,544

 
$
(199
)
Asset-backed securities
6,628

 
(8
)
 
1,870

 
(1
)
 
8,498

 
(9
)
Other securities
6,800

 
(3
)
 
3,966

 
(36
)
 
10,766

 
(39
)
Total securities with unrealized losses(1)
$
121,290

 
$
(196
)
 
$
17,518

 
$
(51
)
 
$
138,808

 
$
(247
)
(1) 
The number of investment positions with unrealized losses at September 30, 2017 and December 31, 2016 totaled 41 and 72, respectively.
Available-for-sale Securities by Contractual Maturity
The contractual maturities of securities available for sale at September 30, 2017, were as follows:
 
Within
1 year
After 1 year
through
5 years
After 5 years
through
10 years
After
10 years
Total
Corporate debt securities
$
90,952

$
32,201

$
—

$
—

$
123,153

Asset-backed securities related to Company-sponsored securitization transactions
—

—

33,285

—

33,285

Certificates of deposit
25,920

—

—

—

25,920

Asset-backed securities
8,228

7,223

—

—

15,451

Commercial paper
9,981

—

—

—

9,981

U.S. agency securities
5,001

—

—

—

5,001

U.S. Treasury securities
—

2,492

—

—

2,492

Other securities
—

4,002

—

—

4,002

Total fair value
$
140,082

$
45,918

$
33,285

$
—

$
219,285

Total amortized cost
$
140,055

$
45,804

$
33,293

$
—

$
219,152