Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net income (loss)	$ 8,586	$ (1,772)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	38,452	43,510
Amortization of debt issuance costs and debt discount	4,382	11,507
Stock-based compensation	2,662	2,620
Deferred income tax expense	6,385	8,735
Provision for uncollectible accounts	1,836	1,468
Earnings in excess of distributions from equity method interest	(13)
Other non-cash expense, net	(2,042)	(292)
Changes in operating assets and liabilities	(4,038)	(8,225)
Net cash provided by operating activities	56,210	57,551
Cash Flows from Investing Activities:
Capital expenditures	(37,715)	(33,463)
Change in unsettled capital expenditures	(5,648)	(943)
Proceeds on sale of assets	2,923	2,665
Net Change in non-current investments		529
Net change in restricted cash	(1,071)	(129)
Net cash used by investing activities	(41,511)	(31,341)
Cash Flows from Financing Activities:
Repayments of long-term debt	(9,255)	(102,738)
Proceeds from the issuance of long-term debt		120,000
Debt issuance costs		(4,448)
Payment of cash dividend on common stock	(6,831)	(29,082)
Payment of withholding taxes on stock-based compensation	(243)	(2,030)
Proceeds from the issuance of common stock	179	199
Net cash used by financing activities	(16,150)	(18,099)
Change in cash and cash equivalents	(1,451)	8,111
Cash and cash equivalents, beginning of period	20,490	15,316
Cash and cash equivalents, end of period	19,039	23,427
Supplemental Cash Flow Data:
Interest paid	24,799	24,415
Income tax refunds	24
Supplemental Non-cash Transactions:
Property acquired under capital leases	(24)	1,841
Dividend declared, but not paid	2,286	9,736
Additions to ARO asset	$ 78	$ 118