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Note Payable - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Deferred financing costs		$ 1,700,000		$ 1,700,000		$ 2,900,000
Repayments of notes payable				$ 16,875,000	$ 36,875,000
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 225,000,000.0
Potential maximum borrowing capacity increase	50,000,000.0
Effective interest rate		4.81%		4.81%
Interest expense		$ 600,000	$ 1,000,000	$ 2,300,000	3,300,000
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Federal funds rate
Debt Instrument [Line Items]
Spread on interest rate				0.50%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Base rate
Debt Instrument [Line Items]
Spread on interest rate				1.00%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				2.50%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Minimum | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				3.00%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of credit | Maximum | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Term facility | Line of credit
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				$ 16,900,000	$ 16,900,000
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Revolving facility | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000.0
Debt term	5 years

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