Summary of Significant Accounting Policies (Details 2) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) item shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Denominator used to compute basic and diluted earnings per share
Basic earnings per share - weighted average shares | shares	10,977,341	10,591,351	10,337,339
Effect of dilutive securities:
Employee and director restricted stock units (in shares) | shares	83,727	143,787	163,101
Warrants (in shares) | shares	325,235	572,913	593,491
Diluted earnings per share - weighted average shares | shares	11,386,303	11,308,051	11,093,931
Advertising
Advertising expense | $	$ 5.9	$ 6.1	$ 4.0
Recently Adopted Accounting Pronouncements
Debt issue costs | $	$ 4.2	5.2
Accounting Standards Update 2015-17 | Previously reported | New Accounting Pronouncement, Early Adoption, Effect
Recently Adopted Accounting Pronouncements
Deferred income taxes, current | $		6.8
Accounting Standards Update 2015-17 | Measurement Period Adjustments | New Accounting Pronouncement, Early Adoption, Effect
Recently Adopted Accounting Pronouncements
Deferred income taxes, noncurrent | $		$ 6.8
Buildings | Minimum
Effect of dilutive securities:
Average economic lives	18 years
Buildings | Maximum
Effect of dilutive securities:
Average economic lives	34 years
Cable and wire | Minimum
Effect of dilutive securities:
Average economic lives	11 years
Cable and wire | Maximum
Effect of dilutive securities:
Average economic lives	37 years
Switching and circuit equipment | Minimum
Effect of dilutive securities:
Average economic lives	6 years
Switching and circuit equipment | Maximum
Effect of dilutive securities:
Average economic lives	15 years
Other Property, Plant and Equipment | Minimum
Effect of dilutive securities:
Average economic lives	4 years
Other Property, Plant and Equipment | Maximum
Effect of dilutive securities:
Average economic lives	17 years
Software
Effect of dilutive securities:
Average economic lives	5 years
Number of stages for segregation of project costs associated with internally developed software | item	3