Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 7,859	$ 11,343
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	58,532	51,965
Loss on early extinguishment of debt	3,660	5,112
Gain on sale of property	(6,546)
Employee retirement benefits	(10,324)	(11,001)
Provision for uncollectibles	2,003	2,526
Stock based compensation	1,886	1,343
Deferred income taxes	6,018
Changes in operating assets and liabilities:
Receivables	(4,142)	(1,552)
Material and supplies	(3,916)	(2,153)
Prepaid expenses and other current assets	(1,064)	(2,600)
Accounts payable and accrued expenses	(2,064)	1,768
Advance billings and customer deposits	323	980
Other current liabilities	106	296
Other	2,446	1,021
Net cash provided by operating activities	54,777	59,048
Cash flows from investing activities:
Capital expenditures	(69,809)	(61,019)
Acquisitions	(11,858)
Proceeds on sale of property	13,118
Net cash used in investing activities	(68,549)	(61,019)
Cash flows from financing activities:
Repayment of capital lease	(406)
Repayment of debt including premium	(302,333)	(306,000)
Proceeds from borrowing	298,500	295,500
Loan refinancing costs	(3,442)	(4,130)
Taxes paid related to net share settlement of equity awards	(426)	(53)
Net cash used in financing activities	(8,107)	(14,683)
Net change in cash and cash equivalents	(21,879)	(16,654)
Cash and cash equivalents, beginning of period	66,993	82,063
Cash and cash equivalents, end of period	45,114	65,409
Supplemental disclosure of cash flow information:
Interest paid, net of amounts capitalized	$ 14,416	$ 17,054