Summary Of Significant Accounting Policies (Net Income Allocation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Summary Of Significant Accounting Policies [Abstract]
Noncontrolling interests - common units	$ 2,703	$ 2,566
Total net income allocable to noncontrolling interests	2,703	2,566
Preferred shareholders	15,122	13,850
Restricted stock unit holders	36	33
Common shareholders	9,940	8,540
Total net income allocable to PS Business Parks, Inc.	25,098	22,423
Net income	$ 27,801	$ 24,989