Summarized Statements of Operations for Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments in and Advances to Affiliates [Line Items]
Total expenses, net	$ 47,126	$ 32,205	$ 131,720	$ 61,203
Net loss	14,609	2,698	417,597	221
Statements Of Operations
Investments in and Advances to Affiliates [Line Items]
Total expenses, net	654	451	1,053	783
Net loss	$ 654	$ 451	$ 1,053	$ 783