Debt Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 05, 2020
Derivative
Incremental interest benefit arising from difference between interest paid and interest received related to swap agreements	$ 300
Incremental interest expense arising from difference between interest paid and interest received related to swap agreements		$ 300	$ 1,700
Forward-starting Interest Rate Swap 3 [Member] | Subsequent Event [Member]
Derivative
Interest rate swap agreement, fixed interest rate				1.38%
Derivative, Notional Amount				$ 150,000
Interest Rate Swap 1
Derivative
Interest rate swap agreement, fixed interest rate	2.273%
Derivative, Notional Amount	$ 75,000
Interest Rate Swap 2
Derivative
Interest rate swap agreement, fixed interest rate	2.111%
Derivative, Notional Amount	$ 25,000
Interest Rate Swap 3
Derivative
Interest rate swap agreement, fixed interest rate	2.111%
Derivative, Notional Amount	$ 50,000