Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Accounts receivable allowance	$ 1,166	$ 753
Mortgages and notes receivable allowance	44	72
Accrued straight-line rents receivable allowance	641	819
Deferred leasing costs, accumulated amortization	149,275	143,512
Prepaid expenses and other assets, accumulated amortization	$ 18,074	$ 19,092
Equity/Capital:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, authorized shares (in shares)	50,000,000	50,000,000
Preferred Stock, liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, shares issued (in shares)	28,877	28,892
Preferred Stock, shares outstanding (in shares)	28,877	28,892
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares (in shares)	200,000,000	200,000,000
Common Stock, shares issued (in shares)	103,557,065	103,266,875
Common Stock, shares outstanding (in shares)	103,557,065	103,266,875
Highwoods Realty Limited Partnership [Member]
Assets:
Accounts receivable allowance	$ 1,166	$ 753
Mortgages and notes receivable allowance	44	72
Accrued straight-line rents receivable allowance	641	819
Deferred leasing costs, accumulated amortization	149,275	143,512
Prepaid expenses and other assets, accumulated amortization	$ 18,074	$ 19,092
Redeemable Operating Partnership Units:
Redeemable Common Units, outstanding (in shares)	2,738,703	2,828,704
Preferred Units liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Series A Preferred Units, issued (in shares)	28,877	28,892
Series A Preferred Units, outstanding (in shares)	28,877	28,892
Common Units:
General partners' capital account, units outstanding (in shares)	1,058,870	1,056,868
Limited partners' capital account, units outstanding (in shares)	102,089,386	101,801,198