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Note Payable Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2014 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Deferred financing costs |  | $ 2,100,000 |  | $ 2,100,000 |  | $ 2,900,000
Repayments of notes payable |  |  |  | $ 11,250,000 | $ 31,250,000 |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 225,000,000.0 |  |  |  |  |
Potential maximum borrowing capacity increase | 50,000,000.0 |  |  |  |  |
Effective interest rate (percent) |  | 4.59% |  | 4.59% |  |
Interest expense |  | $ 900,000 | $ 1,100,000 | $ 1,700,000 | 2,300,000 |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | Base Rate, Condition One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on interest rate (percent) |  |  |  | 0.50% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | Base Rate, Condition Two [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on interest rate (percent) |  |  |  | 1.00% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Description of variable rate basis |  |  |  | one-month LIBOR |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Minimum [Member] | Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 2.50% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Minimum [Member] | Line of Credit [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 1.50% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Maximum [Member] | Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 3.00% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Maximum [Member] | Line of Credit [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 2.00% |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Revolving Facility [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000.0 |  |  |  |  |
Debt term | 5 years |  |  |  |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Term Facility [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000.0 |  |  |  |  |
Debt term | 5 years |  |  |  |  |
Quarterly principal payment |  |  |  | $ 5,600,000 |  |
Repayments of notes payable |  |  |  | $ 11,300,000 | $ 5,600,000 |

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