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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 08, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | $ 1,735 |  | $ 785
Total principal amount | 375,000 |  | 320,000
Less unamortized discount and debt issuance costs(4) | 3,764 |  | 0
Notes payable | 371,236 |  | 320,000
Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | 1,589 |  | 765
Level 2 [Member] | Secured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured notes | 0 |  | 120,000
Level 2 [Member] | Secured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured notes | 0 |  | 20,000
Unsecured debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.40% |
Unsecured debt [Member] | Borrowings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | 385,733 |  | 180,000
Notes payable | 371,236 |  | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | 385,733 |  | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | $ 0 |  | 180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.40% |  |
Unsecured debt | $ 375,000 |  | 0
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities, fair value | $ 0 |  | $ 0
LIBOR [Member] | Level 2 [Member] | Secured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.40% |  |
LIBOR [Member] | Level 2 [Member] | Secured Notes Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.40% |  |
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1125% |  |
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1125% |  |
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1625% |  |
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.1625% |  |

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