UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Shares of Common Stock (no par value)	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2018		49,630,000
Balance at Dec. 31, 2018	$ 444,232		$ 47,456	$ 388,496	$ 8,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,910			13,910
Other comprehensive gain (loss), net of tax	(2,728)				(2,728)
Stock based compensation (in shares)		167,000
Stock based compensation	1,802		1,802
Stock options exercised (in shares)		28,000
Stock options exercised	175		175
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(57,000)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	(2,800)		(2,800)
Common stock issued to acquire non-controlling interest in nTelos		76,000
Balance (in shares) at Mar. 31, 2019		49,844,000
Balance at Mar. 31, 2019	454,599		46,641	402,406	5,552
Balance (in shares) at Dec. 31, 2018		49,630,000
Balance at Dec. 31, 2018	$ 444,232		47,456	388,496	8,280
Balance (in shares) at Dec. 31, 2019	49,671,000	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 non-controlling interest in nTelos		76,000
Balance (in shares) at Mar. 31, 2020	49,842,000	49,842,000
Balance at Mar. 31, 2020	$ 480,650		$ 43,158	$ 443,290	$ (5,798)