UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]	Total
Balance at Dec. 31, 2014	$ 29,712	$ 227,512	$ 1,122	$ 258,346
Balance (in shares) at Dec. 31, 2014	48,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	40,864	0	40,864
Other comprehensive loss, net of tax	0	0	(707)	(707)
Dividends declared ($0.24 per share)	0	(11,629)	0	(11,629)
Dividends reinvested in common stock	$ 544	0	0	544
Dividends reinvested in common stock (in shares)	22
Stock based compensation	$ 2,719	0	0	2,719
Stock options exercised	$ 996	0	0	996
Stock options exercised (in shares)	87
Common stock issued for share awards	$ 0	0	0	0
Common stock issued for share awards (in shares)	212
Common stock issued	$ 11	0	0	11
Common stock issued (in shares)	1
Common stock repurchased	$ (1,885)	0	0	(1,885)
Common stock repurchased (in shares)	(111)
Net excess tax benefit from stock options exercised	$ 679	0	0	679
Balance at Dec. 31, 2015	$ 32,776	256,747	415	289,938
Balance (in shares) at Dec. 31, 2015	48,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	6,885	0	6,885
Other comprehensive loss, net of tax	0	0	(4,285)	(4,285)
Stock based compensation	2,404	0	0	2,404
Stock options exercised	$ 2,942	0	0	2,942
Stock options exercised (in shares)	319
Common stock issued for share awards	$ 0	0	0	0
Common stock issued for share awards (in shares)	188
Common stock issued	$ 5	0	0	5
Common stock issued (in shares)	1
Common stock issued to acquire non-controlling interests of nTelos	$ 10,400	0	0	10,400
Common stock issued to acquire non-controlling interests of nTelos (in shares)	76
Common stock repurchased	$ (4,183)	0	0	(4,183)
Common stock repurchased (in shares)	(177)
Balance at Jun. 30, 2016	$ 44,344	$ 263,633	$ (3,870)	$ 304,107
Balance (in shares) at Jun. 30, 2016	48,883