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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2013	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 12, 2015	Sep. 30, 2014	Dec. 31, 2012
Loss Contingencies [Line Items]
Accrued federal fees		$ 2,742,000	$ 2,742,000	$ 5,684,000
Reversal of accrued federal fees		3,100,000	3,114,000	0	$ 0
Promissory note payable		33,714,000	33,714,000
FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Accrued liability for civil penalty								$ 2,000,000
General and Administrative
Loss Contingencies [Line Items]
interest and penalty expense			600,000	500,000	$ 500,000
2003 through 2012 | USF Obligations
Loss Contingencies [Line Items]
Accrued federal fees									$ 8,100,000
Undisputed portion [Member] | 2003 through 2012 | USF Obligations
Loss Contingencies [Line Items]
Accrued federal fees									4,700,000
Payments for state and local taxes on usage-based fees	$ 600,000
Disputed portion [Member] | 2003 through 2012 | USF Obligations
Loss Contingencies [Line Items]
Accrued federal fees		2,500,000	2,500,000	4,900,000					3,400,000
Disputed portion [Member] | 2003 through 2007 | USF Obligations
Loss Contingencies [Line Items]
Accrued federal fees									$ 800,000
Promissory Note to USAC | USF Obligations
Loss Contingencies [Line Items]
Promissory note issued	$ 4,100,000.0
FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Civil penalty							$ 2,000,000
Notes Payable
Loss Contingencies [Line Items]
Promissory note payable		1,120,000	1,120,000	25,626,000
Notes Payable | Promissory Note to USAC
Loss Contingencies [Line Items]
Promissory note payable		120,000	120,000	1,459,000
Notes Payable | FCC Enforcement Bureau Civil Penalty
Loss Contingencies [Line Items]
Promissory note payable		$ 1,000,000	$ 1,000,000	$ 1,667,000
Civil penalty						$ 2,000,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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