Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative Financial Instruments
Derivative Asset, Current	$ 551,847	$ 383,460
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