Debt (Details) - Schedule of Total Fixed-Rate and Variable-Rate Debt - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Schedule of Total Fixed-Rate and Variable-Rate Debt [Abstract]
Fixed-rate debt	[1]	$ 1,069,067	$ 1,046,273
Fixed-rate debt, Percentage	[1]	77.00%	74.00%
Variable-rate debt	[2]	$ 320,200	$ 371,300
Variable-rate debt, Percentage	[2]	23.00%	26.00%
Total		$ 1,389,267	$ 1,417,573
Weighted-average interest rate of debt		3.76%	3.74%

[1] Fixed-rate debt includes the portion of variable-rate debt where the interest payments have been effectively fixed by interest rate swaps as of the respective balance sheet date. See Note 5 for more information on the interest rate swap agreements.

[2] The Company has two forward interest rate swaps that begin in 2020 that will effectively fix the interest rate on $75 million of the Company's variable-rate debt. See Note 5 for more information on the interest rate swap agreements.