Summary of Significant Accounting Policies - Long-term Asset Related to Jamul Tribe (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 25, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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		$ 16,985	$ (5,635)	$ 16,367	$ (5,635)
Term Loan C Facility
Loan to JIVDC
Proceeds from sale of outstanding note receivable	$ 15,200