UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Shares of Common Stock (no par value)	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2017		49,328
Beginning balance at Dec. 31, 2017	$ 350,222		$ 44,787	$ 297,205	$ 8,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,209			16,209
Other comprehensive loss, net of tax	3,895				3,895
Stock based compensation (in shares)		205
Stock based compensation	3,407		3,407
Stock options exercised (in shares)		15
Stock options exercised	104		104
Common stock issued	10		10
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(66)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	$ (2,136)		(2,136)
Common stock issued to acquire non-controlling interests of nTelos (in shares)	76
Ending balance (in shares) at Jun. 30, 2018		49,558
Ending balance at Jun. 30, 2018	$ 427,808		46,172	369,511	12,125
Beginning balance (in shares) at Mar. 31, 2018		49,539
Beginning balance at Mar. 31, 2018	416,252		45,075	359,885	11,292
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,626			9,626
Other comprehensive loss, net of tax	833				833
Stock based compensation (in shares)		28
Stock based compensation	1,370		1,370
Common stock issued	5		5
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(9)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	(278)		(278)
Ending balance (in shares) at Jun. 30, 2018		49,558
Ending balance at Jun. 30, 2018	$ 427,808		46,172	369,511	12,125
Beginning balance (in shares) at Dec. 31, 2018	49,630	49,630
Beginning balance at Dec. 31, 2018	$ 442,247		47,456	386,511	8,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,060			27,060
Other comprehensive loss, net of tax	(6,940)				(6,940)
Stock based compensation (in shares)		184
Stock based compensation	2,497		2,497
Stock options exercised (in shares)		29
Stock options exercised	81		81
Common stock issued	16		16
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(62)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	$ (2,912)		(2,912)
Common stock issued to acquire non-controlling interests of nTelos (in shares)	76
Ending balance (in shares) at Jun. 30, 2019	49,857	49,857
Ending balance at Jun. 30, 2019	$ 462,049		47,138	413,571	1,340
Beginning balance (in shares) at Mar. 31, 2019		49,844
Beginning balance at Mar. 31, 2019	452,614		46,641	400,421	5,552
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,150			13,150
Other comprehensive loss, net of tax	(4,212)				(4,212)
Stock based compensation (in shares)		17
Stock based compensation	695		695
Stock options exercised (in shares)		1
Stock options exercised	(94)		(94)
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(5)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	$ (112)		(112)
Ending balance (in shares) at Jun. 30, 2019	49,857	49,857
Ending balance at Jun. 30, 2019	$ 462,049		$ 47,138	$ 413,571	$ 1,340