Stockholders' Equity (Dividends and Distributions) (Details) (USD $)	Dec. 19, 2014	Sep. 18, 2014	Jun. 18, 2014	Mar. 20, 2014	Dec. 19, 2013		Sep. 18, 2013	Jun. 25, 2013	May 14, 2013	Dec. 19, 2012	Nov. 29, 2012	Oct. 22, 2012	Jun. 05, 2012	May 01, 2012
Dividends Payable [Line Items]
Dividend declared, amount per share	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.95	[1]	$ 0.50	$ 0.45	$ 0.22	$ 1.16	$ 0.98	$ 0.89	$ 0.57	$ 0.51
Regular Cash Dividend [Member]
Dividends Payable [Line Items]
Dividend declared, amount per share					$ 0.40
Special Cash Dividend [Member]
Dividends Payable [Line Items]
Dividend declared, amount per share					$ 0.55

[1] Comprised of a regular cash dividend of $0.40 per share of common stock and OP unit for the quarter ending December 31, 2013, and an additional special cash dividend of $0.55 per share of its common stock and OP unit. The Company declared the special cash dividend to distribute taxable income from 2013 attributable to the termination of interest rate swap contracts.