Consolidating Financial Information Supplemental Condensed Consolidating Statement of Cash Flows (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 121,686,000	$ 179,282,000	$ 157,848,000
Additions to property and equipment	(26,332,000)	(18,677,000)	(15,372,000)
Principal receipts from long-term receivables	13,122,000	19,452,000	17,553,000
Proceeds from sale of assets	115,642,000	51,642,000	15,777,000
Other	(753,000)	1,087,000	877,000
Cash flows provided by (used in) investing activities	101,679,000	53,504,000	18,835,000
Issuance of debt	40,000,000	0	10,000,000
Issuance of debt	0	(1,725,000,000)	0
Payment of debt	(279,100,000)	(1,794,100,000)	(189,900,000)
Payment of debt issuance costs	(12,295,000)	(57,602,000)	(20,300,000)
Payments for Repurchase of Common Stock	(21,170,000)	0	0
Redemption of Series A Preferred Stock	0	(190,000,000)	0
Dividends	0	(26,117,000)	(24,091,000)
Restricted cash	466,000	119,133,000	15,878,000
Other Financing Activities	7,100,000	10,900,000	(400,000)
Intercompany transfers	0	0	0
Cash flows provided by (used in) financing activities	(264,983,000)	(212,791,000)	(208,812,000)
Net change	(41,618,000)	19,995,000	(32,129,000)
Cash and cash equivalents at beginning of year	102,309,000	82,314,000	114,443,000
Cash and cash equivalents at end of year	60,691,000	102,309,000	82,314,000
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(139,400,000)	21,000,000	13,500,000
Additions to property and equipment	(6,700,000)	(8,500,000)	(9,800,000)
Principal receipts from long-term receivables	0	3,000,000	1,000,000
Proceeds from sale of assets	0	0	0
Other	0	0	0
Cash flows provided by (used in) investing activities	(6,700,000)	(5,500,000)	(8,800,000)
Issuance of debt	40,000,000		0
Issuance of debt		(1,725,000,000)
Payment of debt	(265,700,000)	(56,000,000)	0
Payment of debt issuance costs	(12,300,000)	(57,600,000)	0
Payments for Repurchase of Common Stock	(21,200,000)
Redemption of Series A Preferred Stock		(190,000,000)
Dividends		(26,100,000)	(24,100,000)
Restricted cash	0	0	0
Other Financing Activities	6,200,000	9,800,000	(400,000)
Intercompany transfers	385,600,000	(1,397,200,000)	19,800,000
Cash flows provided by (used in) financing activities	132,600,000	7,900,000	(4,700,000)
Net change	(13,500,000)	23,400,000	0
Cash and cash equivalents at beginning of year	23,400,000	0	0
Cash and cash equivalents at end of year	9,900,000	23,400,000	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	261,400,000	159,800,000	151,200,000
Additions to property and equipment	(19,600,000)	(10,200,000)	(5,500,000)
Principal receipts from long-term receivables	13,100,000	16,500,000	16,600,000
Proceeds from sale of assets	115,600,000	48,900,000	14,500,000
Other	(700,000)	1,100,000	800,000
Cash flows provided by (used in) investing activities	108,400,000	56,300,000	26,400,000
Issuance of debt			10,000,000
Issuance of debt		0
Payment of debt	(13,400,000)	(1,738,100,000)	(189,900,000)
Payment of debt issuance costs		0	(20,300,000)
Payments for Repurchase of Common Stock
Redemption of Series A Preferred Stock		0
Dividends		0	0
Restricted cash	500,000	119,100,000	15,900,000
Other Financing Activities	900,000	1,100,000	0
Intercompany transfers	(384,700,000)	1,398,200,000	(25,300,000)
Cash flows provided by (used in) financing activities	(396,700,000)	(219,700,000)	(209,600,000)
Net change	(26,900,000)	(3,600,000)	(32,000,000)
Cash and cash equivalents at beginning of year	77,300,000	80,900,000	112,900,000
Cash and cash equivalents at end of year	50,400,000	77,300,000	80,900,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(300,000)	(1,500,000)	(6,900,000)
Additions to property and equipment	0	0	0
Principal receipts from long-term receivables	0	0	0
Proceeds from sale of assets	0	2,700,000	1,300,000
Other	0	0	0
Cash flows provided by (used in) investing activities	0	2,700,000	1,300,000
Issuance of debt	0		0
Issuance of debt		0
Payment of debt	0	0	0
Payment of debt issuance costs	0	0	0
Payments for Repurchase of Common Stock
Redemption of Series A Preferred Stock		0
Dividends		0	0
Restricted cash	0	0	0
Other Financing Activities	0	0	0
Intercompany transfers	(900,000)	(1,000,000)	5,500,000
Cash flows provided by (used in) financing activities	(900,000)	(1,000,000)	5,500,000
Net change	(1,200,000)	200,000	(100,000)
Cash and cash equivalents at beginning of year	1,600,000	1,400,000	1,500,000
Cash and cash equivalents at end of year	400,000	1,600,000	1,400,000
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	0	0
Additions to property and equipment	0	0	0
Principal receipts from long-term receivables	0	0	0
Proceeds from sale of assets	0	0	0
Other	0	0	0
Cash flows provided by (used in) investing activities	0	0	0
Issuance of debt	0		0
Issuance of debt		0
Payment of debt	0	0	0
Payment of debt issuance costs	0	0	0
Payments for Repurchase of Common Stock	0
Redemption of Series A Preferred Stock		0
Dividends		0	0
Restricted cash	0	0	0
Other Financing Activities	0	0	0
Intercompany transfers	0	0	0
Cash flows provided by (used in) financing activities	0	0	0
Net change	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0