Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Income
Operating revenues	$ 96,997	$ 94,689	$ 192,961	$ 192,263
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	39,960	39,432	80,244	80,231
Selling, general and administrative	28,516	26,994	56,895	56,020
Gain on sale of property	(6,546)		(6,546)
Depreciation and amortization	19,841	17,354	38,558	33,942
Total operating expenses	81,771	83,780	169,151	170,193
Operating income	15,226	10,909	23,810	22,070
Other income (expense):
Interest expense	(5,083)	(5,414)	(10,623)	(11,400)
Loss on early extinguishment of debt	(3,660)		(3,660)	(5,112)
Interest income and other	6	6	21	18
Total other expense	(8,737)	(5,408)	(14,262)	(16,494)
Income before income tax provision (benefit)	6,489	5,501	9,548	5,576
Income tax provision (benefit)	2,538	(20)	3,750	(152)
Net income	$ 3,951	$ 5,521	$ 5,798	$ 5,728
Net income per common share -
Basic (in dollars per share)	$ 0.38	$ 0.54	$ 0.56	$ 0.56
Diluted (in dollars per share)	$ 0.36	$ 0.51	$ 0.53	$ 0.54
Weighted average shares used to compute net income per common share -
Basic (in shares)	10,335,828	10,241,073	10,313,984	10,221,056
Diluted (in shares)	11,094,681	10,730,095	11,008,101	10,616,201