UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Balance (in shares) at Dec. 31, 2019		49,671,000
Balance at Dec. 31, 2019	$ 472,428		$ 42,110	$ 430,010	$ 308
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,280			13,280
Other comprehensive gain (loss), net of tax	(6,106)				(6,106)
Stock based compensation (in shares)		137,000
Stock based compensation	2,985		2,985
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(42,000)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	(1,945)		(1,945)
Common stock issued to acquire a non-controlling interests of nTelos (in shares)		76,000
Balance (in shares) at Mar. 31, 2020		49,842,000
Balance at Mar. 31, 2020	$ 480,650		43,158	443,290	(5,798)
Balance (in shares) at Dec. 31, 2020	49,868,000	49,868,000
Balance at Dec. 31, 2020	$ 582,394		47,317	539,783	(4,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,521			51,521
Other comprehensive gain (loss), net of tax	773				773
Stock based compensation (in shares)		109,000
Stock based compensation	746		746
Stock options exercised	0		0
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(33,000)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	$ (1,486)		(1,486)
Balance (in shares) at Mar. 31, 2021	49,943,000	49,943,000
Balance at Mar. 31, 2021	$ 633,954		$ 46,583	$ 591,304	$ (3,933)