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Note Payable Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Deferred financing costs |  | $ 4,100,000 |  | $ 4,300,000
Repayments of notes payable |  | $ 25,625,000 | $ 5,625,000 |
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) |  | 3.90% |  |
Interest expense |  | $ 1,200,000 | 1,100,000 |
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 |  | $ 5,600,000 | $ 5,600,000 |

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