Stock Incentive Plans - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended								12 Months Ended
	May 31, 2016 employee $ / shares shares	Feb. 29, 2016 employee $ / shares shares	May 31, 2015 $ / shares shares	Feb. 28, 2015 employee $ / shares shares	May 31, 2014 $ / shares shares	Feb. 28, 2014 employee $ / shares shares	May 31, 2013 $ / shares shares	Feb. 28, 2013 $ / shares shares	Dec. 31, 2016 USD ($) plan $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2005 shares	Dec. 31, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans | plan									2
Stock options outstanding (in shares)									911,000	1,312,000	1,394,000
The 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)												2,880,000
Life of award												P10Y
The 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares authorized for issuance (in shares)											3,000,000
Granted (in shares)									0	0	0
The 2014 Plan [Member] | Management Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of award											P10Y
Stock Options [Member] | The 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)									0	0	0
Stock options outstanding (in shares)									524,642	904,158	997,352		1,101,014
Stock options outstanding (in dollars per share) | $ / shares									$ 6.67	$ 7.70	$ 8.05		$ 8.35
Intrinsic value of outstanding options | $									$ 10,800
Weighted average remaining contractual life									5 years 4 months 6 days
Number of options exercisable (in shares)									428,112
Weighted average exercise price, options exercisable (in dollars per share) | $ / shares									$ 6.61
Intrinsic value, options exercisable | $									$ 8,900
Options exercisable, weighted average remaining contractual term									5 years 2 months 5 days
Share price (in dollars per share) | $ / shares									$ 27.30
Fair value of options vested | $									$ 300
Intrinsic value of options exercised | $									6,800
Proceeds from stock options exercised | $									3,400
Share-based compensation expense | $									58	$ 142	$ 452
Share based compensation income tax benefit | $									23	29	78
Tax benefit realized from exercise of stock options | $									1,700
Compensation, nonvested awards, compensation cost not yet recognized | $									$ 24
Compensation, nonvested awards, cost not yet recognized, period for recognition									2 years
Non Vested Shares [Member] | The 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share) | $ / shares		$ 21.70		$ 15.01
Share-based compensation expense | $									$ 3,400	2,600	2,200
Share based compensation income tax benefit | $									1,400	$ 1,300	$ 900
Compensation, nonvested awards, compensation cost not yet recognized | $									$ 2,100
Compensation, nonvested awards, cost not yet recognized, period for recognition									2 years
Granted (in shares)									172,520	190,258	181,530
Vested and issued (in shares)									190,254	211,498	161,674
Non Vested Shares [Member] | The 2014 Plan [Member] | Management Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options annual vesting percentage									25.00%	25.00%	25.00%
Granted (in shares)		71,936		79,946		135,562
Number of employees participating in grants of non vested shares | employee		23		21		22
Grant date fair value per share (in dollars per share) | $ / shares				$ 21.70		$ 15.01		$ 13.00
Retirement age									55 years
Number of years of service with the company									10 years
Non Vested Shares [Member] | The 2014 Plan [Member] | Former Employees of nTelos [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	12,210
Number of employees participating in grants of non vested shares | employee	6
Grant date fair value per share (in dollars per share) | $ / shares	$ 30.27
Non Vested Shares [Member] | The 2014 Plan [Member] | Employee Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			17,258		29,752		33,664
Grant date fair value per share (in dollars per share) | $ / shares			$ 31.33		$ 17.23		$ 12.83
Vested and issued (in shares)			6,984		10,180		9,390
Retirement age									55 years
Number of years of service with the company									10 years
Vested period for remaining shares									4 years
Non Vested Shares [Member] | The 2014 Plan [Member] | Non Employee Director Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options annual vesting percentage											33.00%
Granted (in shares)				26,790		31,984		12,304
Grant date fair value per share (in dollars per share) | $ / shares				$ 21.70		$ 15.01		$ 13.00
Award vesting period									1 year	1 year
Non Vested Shares [Member] | The 2014 Plan [Member] | Eight Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of award				P3Y
Granted (in shares)		44,326		48,576
Number of employees participating in grants of non vested shares | employee				8
Grant date fair value per share (in dollars per share) | $ / shares		$ 24.10		$ 15.66
Maximum percentage for granted share units				150.00%
Non Vested Shares [Member] | The 2014 Plan [Member] | Eight Management Employees [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		66,489		72,864
Non Vested Shares [Member] | The 2014 Plan [Member] | Eight Management Employees [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				0