Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Carrying Amount [Member]
Assets
Loans Receivable (Level 3)	$ 99,443	$ 72,540
Liabilities
Debt (Level 3)	2,055,807	1,878,208
Fair Value [Member]
Assets
Loans Receivable (Level 3)	95,734	61,734
Liabilities
Debt (Level 3)	$ 2,028,558	$ 1,835,157