Supplemental Disclosure of Statement of Cash Flow Information Other Noncash Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Significant Noncash Transactions [Line Items]
Interest paid	$ 92,788	$ 101,262	$ 103,427
Income taxes paid	4,666	1,018	1,289
Interests Sold [Member]
Other Significant Noncash Transactions [Line Items]
Real estate number of properties sold (in # of properties)	2		3
Real estate non-recourse mortgage debt assumed	40,356	8,921	28,648
Seller financing			3,003
Conveyed Interest [Member]
Other Significant Noncash Transactions [Line Items]
Properties with conveyed interest	4	2
Original debt conversion amount	$ 49,510	$ 12,409