Debt - Summary of Debt - Master Trust Notes (Details) - USD ($)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2018 |
Dec. 31, 2017 |
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
$ 2,084,302
|
|
| Debt discount, net |
(14,733)
|
|
| Deferred financing costs, net |
(14,932)
|
|
| Total debt, net |
$ 2,054,637
|
$ 1,712,846
|
| Weighted Average |
|
|
| Debt Instrument [Line Items] |
|
|
| Remaining Term |
2 years 11 months
|
|
| Master Trust Notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
$ 167,854
|
2,248,504
|
| Debt discount, net |
0
|
(36,188)
|
| Deferred financing costs, net |
(4,189)
|
(24,010)
|
| Total debt, net |
$ 163,665
|
2,188,306
|
| Master Trust Notes | Weighted Average |
|
|
| Debt Instrument [Line Items] |
|
|
| Remaining Term |
5 years
|
|
| Master Trust Notes | Series 2014-1 Class A1 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
0
|
| Master Trust Notes | Series 2014-1 Class A2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
252,437
|
| Master Trust Notes | Series 2014-2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
222,683
|
| Master Trust Notes | Series 2014-3 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
311,336
|
| Master Trust Notes | Series 2014-4 Class A1 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
150,000
|
| Master Trust Notes | Series 2014-4 Class A2 |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
358,664
|
| Master Trust Notes | Series 2017-1 Class A |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
515,280
|
| Master Trust Notes | Series 2017-1 Class B |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
125,400
|
| Master Trust Notes | Total Master Trust 2014 notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
|
1,935,800
|
| Master Trust Notes | Series 2013-1 Class A |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
$ 0
|
125,000
|
| Master Trust Notes | Series 2013-2 Class A |
|
|
| Debt Instrument [Line Items] |
|
|
| Weighted average interest rate |
5.60%
|
|
| Remaining Term |
5 years
|
|
| Long-term debt, gross |
$ 167,854
|
187,704
|
| Master Trust Notes | Total Master Trust 2013 notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Weighted average interest rate |
5.60%
|
|
| Remaining Term |
5 years
|
|
| Long-term debt, gross |
$ 167,854
|
$ 312,704
|