Income Taxes: (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes:

Schedule of components of distributions made to common stockholders on a per share basis

	2012				2011				2010
Ordinary income	$	0.74	33.2	%	$	0.85	41.5	%	$	0.57	27.1	%
Capital gains		1.13	50.7	%		0.01	0.5	%		0.04	1.9	%
Unrecaptured Section 1250 gain		0.36	16.1	%		0.04	2.0	%		—	—
Return of capital		—	—			1.15	56.0	%		1.49	71.0	%
Dividends paid	$	2.23	100.0	%	$	2.05	100.0	%	$	2.10	100.0	%

Schedule of income tax benefit of TRSs

	2012		2011		2010
Current	$	—	$	—	$	(11	)
Deferred		4,159		6,110		9,213
Income tax benefit	$	4,159	$	6,110	$	9,202

Reconciliation of income tax benefit (provision) of the TRSs to the amount computed by applying the federal corporate tax rate

	2012			2011			2010
Book loss for TRSs	$	16,154		$	19,558		$	19,896
Tax at statutory rate on earnings from continuing operations before income taxes	$	5,493		$	6,650		$	6,765
Other		(1,334	)		(540	)		2,437
Income tax benefit	$	4,159		$	6,110		$	9,202

Schedule of tax effects of temporary differences and carryforwards of the TRSs included in net deferred tax assets

	2012			2011
Net operating loss carryforwards	$	33,781		$	29,045
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other costs		(1,973	)		(4,442	)
Other		1,606			2,226
Net deferred tax assets	$	33,414		$	26,829

Reconciliation of the unrecognized tax benefits

	2012		2011		2010
Unrecognized tax benefits at beginning of year	$	—	$	—	$	2,420
Gross increases for tax positions of current year		—		—		—
Gross decreases for tax positions of current year		—		—		(2,420	)
Unrecognized tax benefits at end of year	$	—	$	—	$	—