Notes Payable - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long-Term Debt [Line Items]
Long-term debt, gross	$ 1,713,146
Deferred financing costs	(23,962)	$ (25,690)
Total	1,673,544	1,681,473
Current maturities	31,606	31,606
Long term debt, excluding current maturities	1,641,938	1,649,867
Notes
Long-Term Debt [Line Items]
Long-term debt, gross	347,025	350,000
Unamortized deferred financing costs	(10,711)	(11,359)
Deferred financing costs	(3,958)	(4,224)
Total	332,356	334,417
Current maturities	0	0
Long term debt, excluding current maturities	$ 332,356	$ 334,417