Notes Payable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest incurred and expensed on the notes payable
Loss (gain) on derivatives, net			$ 10	$ (234)
Amortization and write-off of deferred financing fees			1,780	1,472
Total interest incurred and expensed on debt and capital lease obligations	$ 17,289	$ 18,331	34,615	36,614
Notes payable and capital lease obligations
Interest incurred and expensed on the notes payable
Interest expense on debt and capital lease obligations	16,138	17,720	32,825	35,376
Loss (gain) on derivatives, net	10	(125)	10	(234)
Amortization and write-off of deferred financing fees	1,141	736	1,780	1,472
Total interest incurred and expensed on debt and capital lease obligations	$ 17,289	$ 18,331	$ 34,615	$ 36,614