Other Debt - Secured Term Loan Borrowings and Collateral (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 152,390
Mortgages [Member]
Debt Instrument [Line Items]
Long-term debt	4,128,384
Mortgages [Member] | Loans Held For Investment [Member]
Debt Instrument [Line Items]
Long-term debt	13,802
Debt instrument, collateral value	22,197
Mortgages [Member] | Intercompany Mortgage [Member]
Debt Instrument [Line Items]
Long-term debt	7,291
Debt instrument, collateral value	19,117
Mortgages [Member] | Commercial Mortgage Backed Securities [Member]
Debt Instrument [Line Items]
Long-term debt	32,144
Debt instrument, collateral value	44,506
CapLease [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	19,300
CapLease [Member] | Senior Notes [Member] | Secured Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	53,237
Debt instrument, collateral value	$ 85,820