Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Operating revenues	$ 96,795	$ 90,306	$ 272,754	$ 261,842
Operating expenses:
Cost of services and sales	36,346	34,505	111,602	100,880
Selling, general and administrative	25,437	24,121	80,374	68,385
Depreciation and amortization	12,932	14,392	38,452	43,510
Gain on disposal of assets, net	(2,559)	(709)	(2,140)	(590)
Total operating expenses	72,156	72,309	228,288	212,185
Operating income	24,639	17,997	44,466	49,657
Other income and expense:
Interest expense	(10,268)	(9,529)	(29,203)	(28,815)
Loss on extinguishment of debt			(323)	(13,445)
Interest income	9	10	31	26
Other		174		174
Total other income and expense	(10,259)	(9,345)	(29,495)	(42,060)
Income before income tax expense	14,380	8,652	14,971	7,597
Income tax expense	(6,136)	(9,468)	(6,385)	(9,369)
Net income (loss)	8,244	(816)	8,586	(1,772)
Other comprehensive income (loss):
Minimum pension liability adjustment	199	183	541	550
Income tax effect	(82)	(75)	(222)	(226)
Interest rate swap marked to fair value	314	(8,028)	(2,209)	(14,417)
Income tax effect	(129)	3,299	907	5,925
Total other comprehensive income (loss)	302	(4,621)	(983)	(8,168)
Total comprehensive income (loss)	$ 8,546	$ (5,437)	$ 7,603	$ (9,940)
Net income (loss) per share:
Basic	$ 0.18	$ (0.02)	$ 0.19	$ (0.04)
Diluted	$ 0.17	$ (0.02)	$ 0.19	$ (0.04)
Cash dividends declared per common share	$ 0.050	$ 0.215	$ 0.150	$ 0.645