Debt Scheduled Principal Payments on Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Disclosure [Abstract]
2014	$ 142,276
2015	235,980
2016	113,974
2017	190,139
2018	75,224
Thereafter	204,666
Notes payable, total	$ 962,259	[1]	$ 1,057,680	[1]

[1] Excludes unamortized fair market value adjustment of $10.1 million and $13.0 million as of December 31, 2013 and 2012, respectively.