Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

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

	As of December 31, 2012				As of December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair 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