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Debt - Unsecured Term Loan (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Line Of Credit Facility Covenant Actual Results
Debt Instrument [Line Items]
Maximum leverage ratio (as a percent)	0.291
$50 Million Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate	2.41%
Unsecured Term Loan
Debt Instrument [Line Items]
Number of loans | loan	3
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	$ 3,400,000	$ 2,300,000
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 | $50 Million Term Loan
Debt Instrument [Line Items]
Interest rate	3.86%
Principal balance	$ 50,000,000		$ 50,000,000
Unsecured Term Loan | $50 Million Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.45%
Unsecured Term Loan | $50 Million Term Loan | LIBOR | Less than or equal to 25%
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Unsecured Term Loan | $50 Million Term Loan | LIBOR | 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 | LIBOR | 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 | LIBOR | 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 | LIBOR | 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 | LIBOR | Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate	2.20%
Unsecured Term Loan | $100 Million and $200 Million Term Loans | LIBOR | 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 | LIBOR | 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 | LIBOR | 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 | LIBOR | 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 | LIBOR | 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 | LIBOR | Greater than 55%
Debt Instrument [Line Items]
Basis spread on variable rate	2.20%

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