Mortgages and Notes Payable (Tables)

6 Months Ended

Jun. 30, 2011

Mortgages and Notes Payable [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes and the 5.45% Exchangeable Guaranteed Notes.

	6.00% Convertible Guaranteed Notes						5.45% Exchangeable Guaranteed Notes
Balance Sheets:	June 30, 2011			December 31, 2010			June 30, 2011			December 31, 2010
Principal amount of debt component	$	115,000		$	115,000		$	62,150		$	62,150
Unamortized discount	(10,820		)	(11,789		)	(380		)	(712		)
Carrying amount of debt component	$	104,180		$	103,211		$	61,770		$	61,438
Carrying amount of equity component	$	13,134		$	13,134		$	20,293		$	20,293
Effective interest rate	8.1		%	7.5		%	7.0		%	7.0		%
Period through which discount is being amortized, put date	01/2017			01/2017			01/2012			01/2012
Aggregate if-converted value in excess of aggregate principal amount	$	33,188		$	14,036		—			—

	Three months ended June 30,				Six months ended June 30,
Statements of Operations:	2011		2010		2011		2010
6.00% Convertible Guaranteed Notes
Coupon interest	$	1,725	$	1,725	$	3,450	$	2,958
Discount amortization	484		484		969		808
	$	2,209	$	2,209	$	4,419	$	3,766
5.45% Exchangeable Guaranteed Notes
Coupon interest	$	847	$	847	$	1,694	$	1,820
Discount amortization	166		166		332		357
	$	1,013	$	1,013	$	2,026	$	2,177