Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidated Statements of Income
Operating revenues	$ 97,682	$ 96,647	$ 290,643	$ 288,910
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	41,829	41,176	122,073	121,407
Selling, general and administrative	27,965	26,547	84,860	82,567
Gain on sale of property			(6,546)
Depreciation and amortization	19,974	18,023	58,532	51,965
Total operating expenses	89,768	85,746	258,919	255,939
Operating income	7,914	10,901	31,724	32,971
Other income (expense):
Interest expense	(4,089)	(5,490)	(14,712)	(16,890)
Loss on early extinguishment of debt			(3,660)	(5,112)
Interest income and other	7	10	28	28
Total other expense	(4,082)	(5,480)	(18,344)	(21,974)
Income before income tax provision (benefit)	3,832	5,421	13,380	10,997
Income tax provision (benefit)	1,771	(194)	5,521	(346)
Net income	$ 2,061	$ 5,615	$ 7,859	$ 11,343
Net income per common share -
Basic (in dollars per share)	$ 0.20	$ 0.55	$ 0.76	$ 1.11
Diluted (in dollars per share)	$ 0.18	$ 0.52	$ 0.71	$ 1.06
Weighted average shares used to compute net income per common share -
Basic (in shares)	10,337,488	10,246,335	10,321,905	10,230,719
Diluted (in shares)	11,206,159	10,708,454	11,096,177	10,658,517