Related Party Transactions and Arrangements - Investments in SMTA (Details) - USD ($)
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|
3 Months Ended |
6 Months Ended |
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May 31, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
| Related Party Transaction [Line Items] |
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| Preferred stock, shares issued |
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6,900,000
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6,900,000
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|
6,900,000
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| Dividend rate |
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|
|
6.00%
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| Preferred stock, liquidation preference (in USD per share) |
|
$ 25.00
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|
$ 25.00
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|
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| Preferred dividend income from SMTA |
|
$ 3,750,000
|
$ 1,250,000
|
$ 7,500,000
|
$ 1,250,000
|
|
| Preferred equity investment in SMTA |
|
150,000,000
|
|
150,000,000
|
|
$ 150,000,000
|
| Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Preferred dividend income from SMTA |
|
3,800,000
|
|
7,500,000
|
|
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| Dividends receivable |
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$ 3,800,000
|
|
$ 3,800,000
|
|
$ 3,800,000
|
| Spirit MTA REIT | Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Preferred stock, shares issued |
6,000,000.0
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| Aggregate liquidation preference amount |
$ 150,000,000.0
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|
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| Dividend rate |
10.00%
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| Preferred stock, liquidation preference (in USD per share) |
$ 25.00
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| Liquidation value on a quarterly basis (in USD per share) |
0.625
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| Liquidation value on an annual basis (in USD per share) |
$ 2.50
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