Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Real estate properties:
Land	$ 183,060		$ 178,931
Buildings, improvements and lease intangibles	3,048,251		2,861,935
Personal property	9,914		9,267
Land held for development	17,054		17,054
Total real estate properties	3,258,279		3,067,187
Less accumulated depreciation	(700,671)		(632,109)
Total real estate properties, net	2,557,608		2,435,078
Cash and cash equivalents	3,519		8,671
Mortgage notes receivable	1,900	[1]	125,547	[1]
Assets held for sale and discontinued operations, net	9,146		6,852
Other assets, net	185,337		153,514
Total assets	2,757,510		2,729,662
Liabilities:
Notes and bonds payable	1,403,692	[2]	1,348,459	[2]
Accounts payable and accrued liabilities	70,240		73,741
Liabilities of discontinued operations	372		1,112
Other liabilities	62,152		61,064
Total liabilities	1,536,456		1,484,376
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $.01 par value; 50,000 shares authorized; none issued and outstanding	0		0
Common stock, $.01 par value; 150,000 shares authorized; 98,828 and 95,924 shares issued and outstanding at December 31, 2014 and 2013, respectively.	988		959
Additional paid-in capital	2,389,830		2,325,228
Accumulated other comprehensive income (loss)	(2,519)		51
Cumulative net income attributable to common stockholders	840,249		808,362
Cumulative dividends	(2,007,494)		(1,891,123)
Total stockholders’ equity	1,221,054		1,243,477
Noncontrolling interests	0		1,809
Total equity	1,221,054		1,245,286
Total liabilities and equity	$ 2,757,510		$ 2,729,662

[1] Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

[2] Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.