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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2013	Mar. 31, 2013	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2012
Loss Contingencies [Line Items]
Accrued federal fees			$ 1,638	$ 1,151
Principal			258,781
2003 through 2012 | USF obligations
Loss Contingencies [Line Items]
Accrued federal fees						$ 8,100
2003 through 2012 | Undisputed portion | USF obligations
Loss Contingencies [Line Items]
Accrued federal fees						4,700
Payments	$ 600
2003 through 2012 | Disputed portion | USF obligations
Loss Contingencies [Line Items]
Accrued federal fees		$ 3,900				$ 3,400
Disputed liability related to the reversal of interest and penalties					$ 3,100
USF credits					3,100
Year 2003 To Year 2007 | Disputed portion | USF obligations
Loss Contingencies [Line Items]
Accrued federal fees			800		$ 800
2008 through 2012 | Disputed portion | USF obligations
Loss Contingencies [Line Items]
Increase (decrease) in accrual federal fees		$ 500
Promissory Note | USF obligations
Loss Contingencies [Line Items]
Principal	$ 4,100
Universal Services Fund
Loss Contingencies [Line Items]
USF credits			$ 700

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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