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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes receivable | $ 0 |  | $ 0 |  | $ 15,803
Provision for impairment, net of tax | (2,974) | $ 0 | (3,348) | $ 0 |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 35,079 |  | 35,079 |  | 31,662
Available-for-sale Securities | 7,593 |  | 7,593 |  | 9,974
Interest Rate Derivative Assets, at Fair Value | 25,472 |  | 25,472 |  | 14,515
Total | 68,144 |  | 68,144 |  | 56,151
Derivative instruments, at fair value |  |  |  |  | (177)
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total | 22,054 |  | 22,054 |  |
Provision for impairment, net of tax |  |  | (26,200) |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 35,079 |  | 35,079 |  | 31,662
Available-for-sale Securities | 0 |  | 0 |  | 0
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0 |  | 0
Total | 35,079 |  | 35,079 |  | 31,662
Derivative instruments, at fair value |  |  |  |  | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 3,081,052 |  | 3,081,052 |  | 3,058,044
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 0 |  | 0 |  | 0
Available-for-sale Securities | 7,593 |  | 7,593 |  | 9,974
Interest Rate Derivative Assets, at Fair Value | 25,472 |  | 25,472 |  | 14,515
Total | 33,065 |  | 33,065 |  | 24,489
Derivative instruments, at fair value |  |  |  |  | (177)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total | 48,254 |  | 48,254 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes Receivable, Fair Value | 0 |  | 0 |  | 15,660
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 0 |  | 0 |  | 0
Available-for-sale Securities | 0 |  | 0 |  | 0
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Derivative instruments, at fair value |  |  |  |  | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total | 0 |  | 0 |  |
Unsecured Credit Facilities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured credit facilities, Fair Value | 715,000 |  | 715,000 |  | 625,000
Parent Company [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable | 3,118,002 |  | 3,118,002 |  | 2,971,715
Unsecured credit facilities | 713,498 |  | 713,498 |  | $ 623,262
Provision for impairment, net of tax | $ (12,533) | $ 0 | $ (28,587) | $ 0 |

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