Summarized Statements of Operations for Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments in and Advances to Affiliates [Line Items]
Total expenses, net	$ 25,282	$ 33,444	$ 157,002	$ 94,647
Net income (loss)	(156)	4,190	417,441	4,410
Statements Of Operations
Investments in and Advances to Affiliates [Line Items]
Total expenses, net	229	388	1,282	1,170
Net income (loss)	$ 229	$ 388	$ 1,282	$ 1,170