Subsequent Events (Details) - Forward Swap	1 Months Ended	3 Months Ended
	Jul. 31, 2019 USD ($) instrument	Jun. 30, 2019 USD ($) instrument	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	May 31, 2014 USD ($)	Apr. 30, 2013 USD ($)
Subsequent Event [Line Items]
Number of derivatives entered | instrument		1
Notional amount | $		$ 90,000,000	$ 250,000,000	$ 250,000,000	$ 180,000,000	$ 300,000,000	$ 225,000,000	$ 240,000,000
Subsequent Event
Subsequent Event [Line Items]
Number of derivatives entered | instrument	1
Notional amount | $	$ 110,000,000