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Stock-Based and Deferred Compensation Plans Time Based Restricted Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 5.6 $ 5.9 $ 5.1
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Non-vested at January 1, 164 106 47
Non-vested at January 1, $ 18.57 $ 16.75 $ 19.59
Granted 245 96 106
Granted $ 17.05 $ 20.78 $ 16.75
Awards converted pursuant to Hawaiian Telcom acquisition 149 0 0
Awards converted pursuant to Hawaiian Telcom acquisition $ 15.70 $ 0.00 $ 0.00
Vested (61) (38) (47)
Vested $ 18.08 $ 19.10 $ 19.59
Non-vested at December 31, 497 164 106
Non-vested at December 31, $ 17.02 $ 18.57 $ 16.75
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 3.5 $ 1.8 $ 1.1
Tax benefit related to compensation expense (0.8) (0.6) (0.4)
Grant date fair value of awards vested 1.1 $ 0.7 $ 0.9
Unrecognized Compensation $ 4.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years    
Hawaiian Telcom Holdco, Inc. [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years