Summary of Significant Accounting Policies (Cash and Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total cash and cash equivalents	$ 75,452	$ 135,583	$ 119,923	$ 168,056
Restricted cash	45,853	44,370
Corporate [Member]
Total cash and cash equivalents	18,409	40,846
Joint Venture [Member]
Total cash and cash equivalents	$ 57,043	$ 94,737