Notes Payable (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest incurred and expensed on the notes payable
Gain on derivatives, net	$ (109)	$ (157)
Accretion of Senior Notes		3
Total interest incurred and expensed on the notes payable	18,283	17,414
Notes payable
Interest incurred and expensed on the notes payable
Interest expense on debt and capital lease obligations	17,656	16,810
Gain on derivatives, net	(109)	(157)
Accretion of Senior Notes		3
Amortization of deferred financing fees	736	758
Total interest incurred and expensed on the notes payable	$ 18,283	$ 17,414