CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME [Abstract]
Operating revenues	$ 288,075	$ 251,145	$ 195,206
Operating expenses
Cost of goods and services, exclusive of depreciation and amortization shown separately below	117,407	106,640	74,673
Impairment charge on goodwill	10,952	0	0
Selling, general and administrative, exclusive of depreciation and amortization shown separately below	60,646	56,445	45,572
Depreciation and amortization	64,412	55,770	42,630
Total operating expenses	253,417	218,855	162,875	[1]
Gain on sale of directory	0	0	4,000
Operating income	34,658	32,290	36,331
Other income (expense)
Interest expense	(7,850)	(8,289)	(4,716)
Gain (loss) on investments, net	858	(696)	(165)
Non-operating income, net	945	900	717
Income from continuing operations before income taxes	28,611	24,205	32,167
Income tax expense	12,008	10,667	13,393
Net income from continuing operations	16,603	13,538	18,774
Loss from discontinued operations of Converged Services, net of tax benefits of $196, $359 and $480, respectively	(300)	(545)	(699)
Net income	16,303	12,993	18,075
Other comprehensive loss:
Unrealized loss on interest rate swap, net of tax	(863)	0	0
Reclassification gain from pension plans, net of tax	0	0	2,448
Comprehensive income	$ 15,440	$ 12,993	$ 20,523
Basic and diluted net income per share:
Net income from continuing operations (in dollars per share)	$ 0.69	$ 0.57	$ 0.79
Loss from discontinued operations, net of income taxes (in dollars per share)	$ (0.01)	$ (0.02)	$ (0.03)
Net income (in dollars per share)	$ 0.68	$ 0.55	$ 0.76
Weighted average shares outstanding (in shares)	23,877	23,781	23,730
Weighted average shares outstanding, diluted (in shares)	24,019	23,826	23,823

[1] Total operating expenses for 2010 includes $3.8 million of expense, pre-tax, resulting from the settlement of the qualified pension plan and curtailment of the SERP during the second quarter of 2010.