SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income, Net Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income, Net [Line Items]
Other Income/(Loss), Net	$ 21,543	$ 8,038	$ 35,120	$ 10,049
Equity Method Investments
Other Income, Net [Line Items]
Other Income/(Loss), Net	$ 13,300		$ 17,900