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Debt - Unsecured Term Loan (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Number of loans | loan				3
Line Of Credit Facility Covenant Actual Results
Debt Instrument [Line Items]
Maximum leverage ratio (as a percent)		0.298		0.298
Unsecured Term Loan
Debt Instrument [Line Items]
Debt instrument, term (in years)				5 years
Unsecured Term Loan | Less than or equal to 25% | Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.25
Unsecured Term Loan | Greater than 25% but less than or equal to 35% | Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.25
Unsecured Term Loan | Greater than 25% but less than or equal to 35% | Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan | Greater than 35% but less than or equal to 45% | Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.35
Unsecured Term Loan | Greater than 35% but less than or equal to 45% | Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan | Greater than 45% but less than or equal to 50% | Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.45
Unsecured Term Loan | Greater than 45% but less than or equal to 50% | Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.50
Unsecured Term Loan | Greater than 50% but less than or equal to 55% | Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.50
Unsecured Term Loan | Greater than 50% but less than or equal to 55% | Maximum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Unsecured Term Loan | Greater than 55% | Minimum
Debt Instrument [Line Items]
Ratio of net indebtedness to EBITDA				0.55
Unsecured Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Interest incurred on the facility		$ 3,500	$ 2,600	$ 6,900	$ 5,000
Unsecured Term Loan | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.40%
Unsecured Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Less than or equal to 25%
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Greater than 25% but less than or equal to 35%
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Greater than 35% but less than or equal to 45%
Debt Instrument [Line Items]
Basis spread on variable rate				1.60%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Greater than 45% but less than or equal to 50%
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Greater than 50% but less than or equal to 55%
Debt Instrument [Line Items]
Basis spread on variable rate				1.95%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Unsecured Term Loan | $50 Million Term Loan
Debt Instrument [Line Items]
Interest rate		3.86%		3.86%
Principal balance		$ 50,000		$ 50,000		$ 50,000
Unsecured Term Loan | $50 Million Term Loan | Less than or equal to 25%
Debt Instrument [Line Items]
Basis spread on variable rate				1.40%
Unsecured Term Loan | $50 Million Term Loan | Greater than 25% but less than or equal to 35%
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Unsecured Term Loan | $50 Million Term Loan | Greater than 35% but less than or equal to 45%
Debt Instrument [Line Items]
Basis spread on variable rate				1.55%
Unsecured Term Loan | $50 Million Term Loan | Greater than 45% but less than or equal to 50%
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Unsecured Term Loan | $50 Million Term Loan | Greater than 50% but less than or equal to 55%
Debt Instrument [Line Items]
Basis spread on variable rate				1.95%
Unsecured Term Loan | $50 Million Term Loan | Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Unsecured Term Loan | $50 Million Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
Interest Rate Swap | Unsecured Term Loan | $50 Million Term Loan | LIBOR Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.41%

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