Debt - Summary of Debt - Master Trust Notes (Details) - USD ($)
$ in Thousands |
9 Months Ended |
|
Sep. 30, 2017 |
Dec. 31, 2016 |
| Debt Instrument [Line Items] |
|
|
| Total debt, gross |
$ 3,937,485
|
$ 3,754,633
|
| Debt discount, net |
(43,327)
|
(52,894)
|
| Deferred financing costs, net |
(31,013)
|
(37,111)
|
| Total debt, net |
3,863,145
|
3,664,628
|
| Master Trust Notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Total debt, gross |
1,657,402
|
1,672,706
|
| Debt discount, net |
(15,613)
|
(18,787)
|
| Deferred financing costs, net |
(14,050)
|
(16,376)
|
| Total debt, net |
$ 1,627,739
|
1,637,543
|
| Master Trust Notes | Series 2014-1 Class A1 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
5.10%
|
|
| Maturity |
2 years 8 months 12 days
|
|
| Total debt, gross |
$ 45,141
|
53,919
|
| Master Trust Notes | Series 2014-1 Class A2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
5.40%
|
|
| Maturity |
2 years 9 months 18 days
|
|
| Total debt, gross |
$ 253,300
|
253,300
|
| Master Trust Notes | Series 2014-2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
5.80%
|
|
| Maturity |
3 years 6 months
|
|
| Total debt, gross |
$ 223,604
|
226,283
|
| Master Trust Notes | Series 2014-3 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
5.70%
|
|
| Maturity |
4 years 6 months
|
|
| Total debt, gross |
$ 311,459
|
311,820
|
| Master Trust Notes | Series 2014-4 Class A1 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
3.50%
|
|
| Maturity |
2 years 3 months 18 days
|
|
| Total debt, gross |
$ 150,000
|
150,000
|
| Master Trust Notes | Series 2014-4 Class A2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
4.60%
|
|
| Maturity |
12 years 3 months 18 days
|
|
| Total debt, gross |
$ 360,000
|
360,000
|
| Master Trust Notes | Total Master Trust 2014 notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Weighted average interest rate |
5.10%
|
|
| Maturity |
5 years 9 months 18 days
|
|
| Total debt, gross |
$ 1,343,504
|
1,355,322
|
| Master Trust Notes | Series 2013-1 Class A |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
3.90%
|
|
| Maturity |
1 year 2 months 12 days
|
|
| Total debt, gross |
$ 125,000
|
125,000
|
| Master Trust Notes | Series 2013-2 Class A |
|
|
| Debt Instrument [Line Items] |
|
|
| Stated interest rate |
5.30%
|
|
| Maturity |
6 years 2 months 12 days
|
|
| Total debt, gross |
$ 188,898
|
192,384
|
| Master Trust Notes | Total Master Trust 2013 notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Weighted average interest rate |
4.70%
|
|
| Maturity |
4 years 2 months 12 days
|
|
| Total debt, gross |
$ 313,898
|
$ 317,384
|