Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 5,798	$ 5,728
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	38,558	33,942
Loss on early extinguishment of debt	3,660	5,112
Gain on sale of property	(6,546)
Employee retirement benefits	(5,708)	(5,018)
Provision for uncollectibles	1,403	1,905
Stock based compensation	1,151	840
Deferred income taxes	3,985
Changes in operating assets and liabilities:
Receivables	(665)	2,716
Material and supplies	(450)	(2,127)
Prepaid expenses and other current assets	(1,816)	(2,065)
Accounts payable and accrued expenses	(9,558)	(3,367)
Advance billings and customer deposits	1,034	1,334
Other current liabilities	39	211
Other	241	394
Net cash provided by operating activities	31,126	39,605
Cash flows from investing activities:
Capital expenditures	(44,978)	(41,235)
Proceeds on sale of property	13,118
Net cash used in investing activities	(31,860)	(41,235)
Cash flows from financing activities:
Repayment of capital lease	(284)
Repayment of debt including premium	(302,221)	(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	(392)	(45)
Net cash used in financing activities	(7,839)	(14,675)
Net change in cash and cash equivalents	(8,573)	(16,305)
Cash and cash equivalents, beginning of period	66,993	82,063
Cash and cash equivalents, end of period	58,420	65,758
Supplemental disclosure of cash flow information:
Interest paid, net of amounts capitalized	$ 12,317	$ 12,067