Summary of Significant Accounting Policies - Long-term Asset Related to Jamul Tribe (Details) - Tribe $ in Millions	Apr. 05, 2013 USD ($) a ft² item	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Long-term asset related to the Jamul Tribe
Land owned (in acres) | a	6
Proposed facility development cost	$ 390.0
Number of stories at facility | item	3
Size of gaming floor at and entertainment facility (in square feet) | ft²	200,000
Number of slot machines at facility | item	1,700
Number of table games at facility | item	43
Number of parking spaces | item	1,800
Anticipated loan funding		$ 390.0
Senior Loans, includes accrued interest		299.1	$ 197.7
Interest accrued		25.3	$ 13.9
Maximum
Long-term asset related to the Jamul Tribe
Loan commitment		$ 400.0