Consolidating Financial Information Supplemental Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 36,356	$ 48,188
Additions to property and equipment	(10,650)	(13,510)
Principal receipts from long-term receivables	6,577	7,055
Proceeds from Sale of Productive Assets	21,500	55,494
Other	(760)	(574)
Cash flows provided by (used in) investing activities	16,667	48,465
Revolving credit borrowings	35,000	25,000
Revolving credit repayments	(35,000)	(25,000)
Payment of debt	(82,162)	(160,201)
Payment of debt issuance costs	0	(12,316)
Payments for Repurchase of Common Stock	0
Restricted cash	(3,777)	1,492
Other Financing Activities	4,596	6,585
Intercompany transfers	0	0
Cash flows provided by (used in) financing activities	(81,343)	(164,440)
Net change	(28,320)	(67,787)
Cash and cash equivalents at beginning of period	60,691	102,309
Cash and cash equivalents at end of period	32,371	34,522
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(64,900)	(79,700)
Additions to property and equipment	(3,000)	(4,000)
Principal receipts from long-term receivables	0	0
Proceeds from Sale of Productive Assets	0	0
Other	0	0
Cash flows provided by (used in) investing activities	(3,000)	(4,000)
Revolving credit borrowings	35,000	25,000
Revolving credit repayments	35,000	25,000
Payment of debt	(76,000)	(153,400)
Payment of debt issuance costs	0	(12,300)
Payments for Repurchase of Common Stock	0
Restricted cash	0	0
Other Financing Activities	3,900	6,200
Intercompany transfers	130,100	226,600
Cash flows provided by (used in) financing activities	58,000	67,100
Net change	(9,900)	(16,600)
Cash and cash equivalents at beginning of period	9,900	23,400
Cash and cash equivalents at end of period	0	6,800
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	101,100	127,400
Additions to property and equipment	(7,700)	(9,500)
Principal receipts from long-term receivables	6,600	7,100
Proceeds from Sale of Productive Assets	21,500	55,500
Other	(800)	(600)
Cash flows provided by (used in) investing activities	19,600	52,500
Revolving credit borrowings	0	0
Revolving credit repayments	0
Payment of debt	(6,100)	(6,800)
Payment of debt issuance costs	0	0
Payments for Repurchase of Common Stock	0
Restricted cash	(3,800)	1,500
Other Financing Activities	700	300
Intercompany transfers	(130,000)	(225,000)
Cash flows provided by (used in) financing activities	(139,200)	(230,000)
Net change	(18,500)	(50,100)
Cash and cash equivalents at beginning of period	50,400	77,300
Cash and cash equivalents at end of period	31,900	27,200
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	200	500
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Proceeds from Sale of Productive Assets	0	0
Other	0	0
Cash flows provided by (used in) investing activities	0	0
Revolving credit borrowings	0	0
Revolving credit repayments	0
Payment of debt	0	0
Payment of debt issuance costs	0	0
Payments for Repurchase of Common Stock	0
Restricted cash	0	0
Other Financing Activities	0	0
Intercompany transfers	(100)	(1,600)
Cash flows provided by (used in) financing activities	(100)	(1,600)
Net change	100	(1,100)
Cash and cash equivalents at beginning of period	400	1,600
Cash and cash equivalents at end of period	500	500
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	0
Additions to property and equipment		0
Principal receipts from long-term receivables	0	0
Proceeds from Sale of Productive Assets	0	0
Other	0	0
Cash flows provided by (used in) investing activities	0	0
Revolving credit borrowings	0	0
Revolving credit repayments	0
Payment of debt	0	0
Payment of debt issuance costs	0	0
Payments for Repurchase of Common Stock	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	0
Cash and cash equivalents at end of period	$ 0	$ 0