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Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2017 and 2016, were as follows:
December 31, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Asset-backed senior securities related to Company-sponsored securitizations (1)
36,953

 
73

 
(6
)
 
37,020

Certificates of deposit
24,758

 
—

 
—

 
24,758

Corporate debt securities
16,268

 
1

 
(11
)
 
16,258

Asset-backed securities
14,843

 
1

 
(1
)
 
14,843

Commercial paper
14,665

 
—

 
—

 
14,665

Asset-backed subordinated residual certificates related to Company-sponsored securitizations and CLUB Certificate transactions (1)
10,058

 
11

 
(40
)
 
10,029

Total securities available for sale
$
117,545

 
$
86

 
$
(58
)
 
$
117,573

 
 
 
 
 
 
 
 
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 December 31, 2017 and 2016, aggregated by period of continuous unrealized loss, is as follows:
 
Less than
12 months
 
12 months
or longer
 
Total
December 31, 2017
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Asset-backed securities related to Company-sponsored securitizations and CLUB Certificate transactions
$
26,534

 
$
(46
)
 
$
—

 
$
—

 
$
26,534

 
$
(46
)
Corporate debt securities
14,368

 
(11
)
 
—

 
—

 
14,368

 
(11
)
Asset-backed securities
4,401

 
(1
)
 
—

 
—

 
4,401

 
(1
)
Total securities with unrealized losses (1)
$
45,303

 
$
(58
)
 
$
—

 
$
—

 
$
45,303

 
$
(58
)
 
 
 
 
 
 
 
 
 
 
 
 
 
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 December 31, 2017 and 2016 totaled 24 and 72, respectively.
Investments Classified by Contractual Maturity Date
The contractual maturities of securities available for sale at December 31, 2017, were as follows:
 
Within
1 year
 
After 1 year
through
5 years
 
After 5 years
through
10 years
 
After
10 years
 
Total
Asset-backed securities related to Company-sponsored securitizations and CLUB Certificate transactions
$
—

 
$
—

 
$
45,256

 
$
1,793

 
$
47,049

Certificates of deposit
24,758

 
—

 
—

 
—

 
24,758

Corporate debt securities
16,258

 
—

 
—

 
—

 
16,258

Asset-backed securities
14,843

 
—

 
—

 
—

 
14,843

Commercial paper
14,665

 
—

 
—

 
—

 
14,665

Total fair value
$
70,524

 
$
—

 
$
45,256

 
$
1,793

 
$
117,573

Total amortized cost
$
70,534

 
$
—

 
$
45,215

 
$
1,796

 
$
117,545
Schedule of Proceeds from Sales and Realized Gain (Loss) on Available-for-sale Securities
roceeds and gross realized gains and losses from sales of securities available for sale were as follows:
Year Ended December 31,
2017
 
2016
 
2015
Proceeds
$
125,522

 
$
2,494

 
$
120,420

Gross realized gains
$
196

 
$
2

 
$
133

Gross realized losses
$
(26
)
 
$
—

 
$
4