Notes Payable - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Expense
Interest expense on debt and finance lease obligations	$ 12,037	$ 11,484	$ 22,765	$ 22,993
Noncash interest on derivatives and finance lease obligations, net	216	3,634	6,296	5,753
Amortization of deferred financing costs	697	698	1,396	1,396
Total interest expense	$ 12,950	$ 15,816	$ 30,457	$ 30,142