Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) state	Mar. 31, 2015 USD ($)	Apr. 01, 2016 ft² property state	Dec. 31, 2015 USD ($)
Entity Information [Line Items]
Number of states in which office properties are located | state	6
Percentage of noncontrolling interest in operating partnerships	4.10%
Impairment loss on real estate	$ 0	$ 1,000
Subsequent Event
Entity Information [Line Items]
Number of office and parking properties | property			34
Number of states in which office properties are located | state			6
Net rentable area (sqft) | ft²			14.0
Subsidiaries | Subsequent Event
Entity Information [Line Items]
Net rentable area (sqft) | ft²			2.7
Parkway Properties LP
Entity Information [Line Items]
Company's Ownership %	95.90%
Variable Interest Entity, Primary Beneficiary | Fund II
Entity Information [Line Items]
Total assets of consolidated VIE	$ 472,800			$ 536,500
Total liabilities of consolidated VIE	$ 256,500			$ 294,100