Derivative Financial Instruments Cash flow hedges (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Reclassifications into Interest expense on cash flow hedge	$ 30,000	$ 2,000	$ 183,000	$ 18,000
Fair Value of Interest Rate Swaps	14,200,000		14,200,000		$ 2,500,000
Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate swaps related to debt	20,000,000		20,000,000		60,000,000
Interest rate swaps related to debt	130,000,000		130,000,000		50,000,000
Other assets | Interest Rate Swap [Member]
Derivative [Line Items]
Fair Value of Interest Rate Swaps	105,000		105,000		2,093,000
Liability [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Fair Value of Interest Rate Swaps	$ 6,026,000		$ 6,026,000		$ 1,111,000