Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Values of Financial Instruments [Abstract]

Schedule of fair value, assets and liabilities measured on recurring basis

	As of December 31, 2012					As of December 31, 2011
	Carrying			Fair		Carrying		Fair
	Amount			Value		Amount		Value
	(In thousands)
Financial Assets:
Cash and cash equivalents		$	81,856	$	81,856	$	75,183	$	75,183
Financial Liabilities:
Mortgage notes payable		$	605,889	$	623,604	$	752,414	$	761,942
Notes payable to banks			262,000		254,215		132,322		125,494
Interest rate swap agreements			16,285		16,285		11,134		11,134