Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 106,917	$ 135,583	$ 139,858	$ 119,923
Restricted Cash	39,493	44,370
Joint Venture [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	58,523	94,737
Corporate non-segment [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 48,394	$ 40,846