Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Derivative Financial Instruments
Derivative financial instruments		$ 556,828
Treasury Stock
Treasury Stock, Shares, Retired	56,118,260
Treasury stock, at cost (Note 2)		$ (1,569,459)
Accumulated Earnings (Deficit)
Treasury Stock
Treasury stock, at cost (Note 2)	$ 1,568,000
Class A common stock
Treasury Stock
Treasury stock, at cost (Note 2)	$ 600
Northstar Manager LLC
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	5 years
SNR Wireless Management LLC
Variable Interest Entity
Number of years after wireless spectrum license is granted until put right vests	5 years