Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net income	$ 26,982	$ 33,152	$ 25,935
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88,745	87,142	85,227
Deferred income taxes	8,546	(2,390)	57
Decrease in uncertain tax positions	(262)	(5,169)
Loss on disposal of assets	370	2,057	2,491
Cash distributions from wireless partnerships in excess of/(less than) current earnings	945	16	(3,091)
Stock-based compensation expense	2,132	2,363	1,927
Amortization of deferred financing costs	1,411	1,293	1,301
Changes in operating assets and liabilities:
Accounts receivable, net	6,520	113	2,967
Income taxes receivable	(2,498)	(3,699)	775
Inventories	821	(1,084)	608
Other assets	280	273	363
Accounts payable	3,701	(3,510)	1,146
Accrued expenses and other liabilities	(7,509)	4,457	(3,399)
Net cash provided by operating activities	130,184	115,014	116,307
Investing Activities
Additions to property, plant and equipment, net	(42,593)	(41,789)	(42,352)
Proceeds from the sale of assets	840	1,065	725
Other	272	35
Net cash used for investing activities	(41,481)	(40,689)	(41,627)
Financing Activities
Fees paid for the modification of debt	(3,471)
Distributions to noncontrolling interest		(1,850)
Payment of capital lease obligation	(149)	(399)	(922)
Repurchase and retirement of common stock	(726)	(1,001)	(545)
Dividends on common stock	(46,307)	(46,179)	(45,926)
Net cash used for financing activities	(50,653)	(49,429)	(47,393)
Net increase in cash and equivalents	38,050	24,896	27,287
Cash and cash equivalents at beginning of year	67,654	42,758	15,471
Cash and cash equivalents at end of year	105,704	67,654	42,758
Supplemental disclosure of cash flow:
Interest paid	47,215	50,205	56,026
Income taxes paid	$ 8,788	$ 18,706	$ 10,996