Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common  Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Accumulated Other Comprehensive Income/(Loss)	Non- controlling Interest
Beginning balance (in shares) at Dec. 31, 2020		123,839,000
Beginning balance at Dec. 31, 2020	$ 1,897,961	$ 1,238	$ 3,693,996	$ (1,774,856)	$ (24,100)	$ 1,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Costs of issuance of common stock	(55)		(55)
Dividends to common stockholders and stockholders of subsidiaries	(78,209)			(78,182)		(27)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		297,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	6,270	$ 3	6,267
Net loss applicable to noncontrolling interests	(9)					(9)
Net income applicable to Piedmont	30,597			30,597
Other comprehensive income	4,064				4,064
Ending balance (in shares) at Sep. 30, 2021		124,136,000
Ending balance at Sep. 30, 2021	1,860,619	$ 1,241	3,700,208	(1,822,441)	(20,036)	1,647
Beginning balance (in shares) at Jun. 30, 2021		124,132,000
Beginning balance at Jun. 30, 2021	1,872,508	$ 1,241	3,698,656	(1,807,679)	(21,368)	1,658
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common stockholders and stockholders of subsidiaries	(26,074)			(26,068)		(6)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		4,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	1,552		1,552
Net loss applicable to noncontrolling interests	(5)					(5)
Net income applicable to Piedmont	11,306			11,306
Other comprehensive income	1,332				1,332
Ending balance (in shares) at Sep. 30, 2021		124,136,000
Ending balance at Sep. 30, 2021	$ 1,860,619	$ 1,241	3,700,208	(1,822,441)	(20,036)	1,647
Beginning balance (in shares) at Dec. 31, 2021	123,076,695	123,077,000
Beginning balance at Dec. 31, 2021	$ 1,787,423	$ 1,231	3,701,798	(1,899,081)	(18,154)	1,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Costs of issuance of common stock	(461)		(461)
Dividends to common stockholders and stockholders of subsidiaries	(77,751)			(77,724)		(27)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		318,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	7,900	$ 3	7,897
Net loss applicable to noncontrolling interests	(1)					(1)
Net income applicable to Piedmont	71,261			71,261
Other comprehensive income	$ 8,960				8,960
Ending balance (in shares) at Sep. 30, 2022	123,395,381	123,395,000
Ending balance at Sep. 30, 2022	$ 1,797,331	$ 1,234	3,709,234	(1,905,544)	(9,194)	1,601
Beginning balance (in shares) at Jun. 30, 2022		123,390,000
Beginning balance at Jun. 30, 2022	1,815,663	$ 1,234	3,707,833	(1,882,962)	(12,050)	1,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Costs of issuance of common stock	(461)		(461)
Dividends to common stockholders and stockholders of subsidiaries	(25,920)			(25,913)		(7)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		5,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	1,862		1,862
Net loss applicable to noncontrolling interests	0
Net income applicable to Piedmont	3,331			3,331
Other comprehensive income	$ 2,856				2,856
Ending balance (in shares) at Sep. 30, 2022	123,395,381	123,395,000
Ending balance at Sep. 30, 2022	$ 1,797,331	$ 1,234	$ 3,709,234	$ (1,905,544)	$ (9,194)	$ 1,601