Notes Payable (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest incurred and expensed on the notes payable
Gain on derivatives, net		$ (109)
Amortization of deferred financing fees	639	736
Total interest incurred and expensed on debt and capital lease obligations	17,326	18,283
Notes payable and capital lease obligations
Interest incurred and expensed on the notes payable
Interest expense on debt and capital lease obligations	16,687	17,656
Gain on derivatives, net		(109)
Amortization of deferred financing fees	639	736
Total interest incurred and expensed on debt and capital lease obligations	$ 17,326	$ 18,283