Consolidating Financial Information Supplemental Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets	$ 21,390	$ 54,597
Cash flows provided by (used in) operating activities	44,693	50,476
Additions to property and equipment	(4,150)	(3,835)
Principal receipts from long-term receivables	3,437	3,395
Other	699	(128)
Cash flows provided by (used in) investing activities	21,376	54,029
Payment of debt	79,044	148,826
Payment of debt issuance costs	0	(12,208)
Restricted cash	(2,639)	(2,392)
Other Financing Activities	3,607	6,972
Intercompany transfers	0	0
Cash flows provided by (used in) financing activities	(78,076)	(156,454)
Net change	(12,007)	(51,949)
Cash and cash equivalents at beginning of period	60,691	102,309
Cash and cash equivalents at end of period	48,684	50,360
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets	0	0
Cash flows provided by (used in) operating activities	(15,000)	(26,300)
Additions to property and equipment	(1,300)	(1,300)
Principal receipts from long-term receivables	0	0
Other	0	0
Cash flows provided by (used in) investing activities	(1,300)	(1,300)
Payment of debt	(76,000)	(145,300)
Payment of debt issuance costs		(12,200)
Restricted cash	0	0
Other Financing Activities	3,100	6,200
Intercompany transfers	87,000	169,600
Cash flows provided by (used in) financing activities	14,100	18,300
Net change	(2,200)	(9,300)
Cash and cash equivalents at beginning of period	9,900
Cash and cash equivalents at end of period	7,700	14,100
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets	21,400	3,400
Cash flows provided by (used in) operating activities	59,800	76,300
Additions to property and equipment	(2,800)	(2,500)
Principal receipts from long-term receivables	3,400	54,600
Other	700	(200)
Cash flows provided by (used in) investing activities	22,700	55,300
Payment of debt	(3,000)	(3,500)
Payment of debt issuance costs		0
Restricted cash	(2,600)	(2,400)
Other Financing Activities	400	800
Intercompany transfers	(87,500)	(169,300)
Cash flows provided by (used in) financing activities	(92,700)	(174,400)
Net change	(10,200)	(42,800)
Cash and cash equivalents at beginning of period	50,400
Cash and cash equivalents at end of period	40,200	34,500
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets	0	0
Cash flows provided by (used in) operating activities	(100)	500
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Other	0	0
Cash flows provided by (used in) investing activities	0	0
Payment of debt	0	0
Payment of debt issuance costs		0
Restricted cash	0	0
Other Financing Activities	0	0
Intercompany transfers	500	(300)
Cash flows provided by (used in) financing activities	500	(300)
Net change	400	200
Cash and cash equivalents at beginning of period	400
Cash and cash equivalents at end of period	800	1,800
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets	0	0
Cash flows provided by (used in) operating activities	0	0
Additions to property and equipment		0
Principal receipts from long-term receivables	0	0
Other	0	0
Cash flows provided by (used in) investing activities	0	0
Payment of debt	0	0
Payment of debt issuance costs		0
Restricted cash	0	0
Other Financing Activities	0	0
Intercompany transfers	0	0
Cash flows provided by (used in) financing activities	0	0
Net change	0	0
Cash and cash equivalents at beginning of period	0
Cash and cash equivalents at end of period	$ 0	$ 0