Assets and Liabilities Measured at Fair Value (Details 3) (USD $)	3 Months Ended	6 Months Ended			12 Months Ended	3 Months Ended			12 Months Ended								12 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2012 Chase Park Plaza	Jun. 30, 2013 Becket House Leasehold Interest	Mar. 31, 2013 Becket House Leasehold Interest	Dec. 31, 2012 Becket House Leasehold Interest	Dec. 31, 2012 Bent Tree Green	Dec. 31, 2012 Gain/ (Loss) Bent Tree Green	Dec. 31, 2012 Nonrecurring fair value measurements Rio Salado	Dec. 31, 2012 Nonrecurring fair value measurements Cordillera	Dec. 31, 2012 Nonrecurring fair value measurements Gain/ (Loss)	Jun. 30, 2013 Nonrecurring fair value measurements Gain/ (Loss) Leasehold Interest	Dec. 31, 2012 Nonrecurring fair value measurements Level 2	Jun. 30, 2013 Nonrecurring fair value measurements Level 2 Leasehold Interest	Dec. 31, 2012 Nonrecurring fair value measurements Level 2 Rio Salado	Dec. 31, 2012 Nonrecurring fair value measurements Level 3	Dec. 31, 2012 Nonrecurring fair value measurements Level 3 Cordillera	Dec. 31, 2012 Nonrecurring fair value measurements Total Fair Value	Jun. 30, 2013 Nonrecurring fair value measurements Total Fair Value Leasehold Interest
Assets
Intangibles assets, net								$ 19,580,000						$ (305,000)		$ 18,106,000					$ 18,106,000
Impairment charge		305,000				0	300,000
Real estate under development		99,000		9,310,000									(7,289,000)		9,150,000					9,150,000
Condominium inventory (work in progress)													(11,723,000)					1,150,000		1,150,000
Condominium inventory (finished units)													(438,000)					13,120,000		13,120,000
Note receivable, net													(12,249,000)					18,037,000		18,037,000
Total													(31,699,000)		9,150,000			32,307,000		41,457,000
Impairment loss of discontinued operations									1,300,000	1,300,000
Condominium inventory impairment charges		0										11,700,000							11,700,000
Other asset impairment charges											7,300,000						7,300,000
Reclassification of condominium inventory to land																			700,000
Reclassification of condominium inventory to building																			500,000
Provision for loan losses	$ 12,022,000		$ 12,022,000		$ 200,000