Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2011

Debt Obligations [Abstract]

Summary Of Credit Facilities And Related Information

		September 30,		September 30,
	December 31,
	2011		2010
Letters of credit outstanding	$	4,785	$	4,911
Borrowings		—		—

		September 30,		September 30,		September 30,
	Year Ended December 31,
	2011		2010		2009
Interest expense (including commitment and letter of credit fees)	$	1,302	$	818	$	1,168
Amortization of issuance costs		725		1,570		878