Mortgages and Notes Payable (Tables)

6 Months Ended

Jun. 30, 2012

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, 2012			December 31, 2011			June 30, 2012		December 31, 2011
Principal amount of debt component	$	115,000		$	115,000		$	—	$	62,150
Unamortized discount	(8,882		)	(9,851		)	—		(48		)
Carrying amount of debt component	$	106,118		$	105,149		$	—	$	62,102
Carrying amount of equity component	$	13,134		$	13,134		$	—	$	20,293
Effective interest rate	8.1		%	8.1		%	—		7.0		%
Period through which discount is being amortized, put date	01/2017			01/2017			—		01/2012
Aggregate if-converted value in excess of aggregate principal amount	$	23,989		$	7,907		$	—	$	—

	Three months ended June 30,				Six months ended June 30,
Statements of Operations:	2012		2011		2012		2011
6.00% Convertible Guaranteed Notes
Coupon interest	$	1,725	$	1,725	$	3,450	$	3,450
Discount amortization	484		484		969		969
	$	2,209	$	2,209	$	4,419	$	4,419
5.45% Exchangeable Guaranteed Notes
Coupon interest	$	—	$	847	$	188	$	1,694
Discount amortization	—		166		34		332
	$	—	$	1,013	$	222	$	2,026