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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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