Nature Of Operations And Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Cost adjustment period	2 years
Advertising and promotional expenses	$ 0.8	$ 1.1
Company's Revenues [Member]
Significant Accounting Policies [Line Items]
Percentage of regulatory revenue	3.00%	5.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Minimum [Member] | Support Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Minimum [Member] | Communication And Network Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Minimum [Member] | Buildings And Other Support Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	4 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life	15 years
Cash balance amount insured by FDIC	$ 0.25
Maximum [Member] | Support Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	19 years
Maximum [Member] | Communication And Network Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	5 years
Maximum [Member] | Buildings And Other Support Equipment [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	50 years
Seat Licenses [Member]
Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Customer Relationships [Member]
Significant Accounting Policies [Line Items]
Estimated useful life	8 years	8 years