Summary of Significant Accounting Policies - Long-term Asset Related to Jamul Tribe (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	May 25, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loan to JIVDC
Proceeds from sale of outstanding note receivable			$ 15,186
Recovery of previously recorded provisions for loan and unfunded loan commitment losses		$ (24,317)	$ 16,367	$ (29,952)
Term Loan C Facility
Loan to JIVDC
Proceeds from sale of outstanding note receivable	$ 15,200