Consolidating Financial Information Supplemental Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 55,429	$ 36,356
Cash flows from investing activities:
Additions to property and equipment	(2,953)	(10,650)
Proceeds from sale of assets	0	21,500
Principal receipts from long-term receivables	7,063	6,577
Other	11	(760)
Cash flows provided by investing activities	4,121	16,667
Cash flows from financing activities:
Borrowings under revolving credit facilities	0	35,000
Repayments under revolving credit facilities	0	(35,000)
Payment of debt	(7,433)	(82,162)
Payment of debt modification costs	(1,281)	0
Repurchase of common stock	(14,504)	0
Dividends paid on common stock	(28,885)	0
Restricted cash	1,564	(3,777)
Other	2,074	4,596
Intercompany transfers	0	0
Cash flows used in financing activities	(48,450)	(81,343)
Net change in cash and cash equivalents	11,100	(28,320)
Cash and cash equivalents at beginning of period	64,537	60,691
Cash and cash equivalents at end of period	75,637	32,371
Parent
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(62,700)	(64,900)
Cash flows from investing activities:
Additions to property and equipment	(2,400)	(3,000)
Proceeds from sale of assets	0	0
Principal receipts from long-term receivables	0	0
Other	0	0
Cash flows provided by investing activities	(2,400)	(3,000)
Cash flows from financing activities:
Borrowings under revolving credit facilities		35,000
Repayments under revolving credit facilities		(35,000)
Payment of debt	(2,400)	(76,000)
Payment of debt modification costs	(1,300)
Repurchase of common stock	(14,500)
Dividends paid on common stock	(28,885)
Restricted cash	0	0
Other	1,900	3,900
Intercompany transfers	121,200	130,100
Cash flows used in financing activities	76,100	58,000
Net change in cash and cash equivalents	11,000	(9,900)
Cash and cash equivalents at beginning of period	9,900	9,900
Cash and cash equivalents at end of period	20,900	0
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	118,200	101,100
Cash flows from investing activities:
Additions to property and equipment	(500)	(7,700)
Proceeds from sale of assets	7,100	21,500
Principal receipts from long-term receivables	0	6,600
Other	0	(800)
Cash flows provided by investing activities	6,500	19,600
Cash flows from financing activities:
Borrowings under revolving credit facilities		0
Repayments under revolving credit facilities		0
Payment of debt	(5,000)	(6,100)
Payment of debt modification costs	0
Repurchase of common stock	0
Dividends paid on common stock	0
Restricted cash	1,600	(3,800)
Other	100	700
Intercompany transfers	(121,300)	(130,000)
Cash flows used in financing activities	(124,600)	(139,200)
Net change in cash and cash equivalents	100	(18,500)
Cash and cash equivalents at beginning of period	54,000	50,300
Cash and cash equivalents at end of period	54,000	31,900
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(100)	100
Cash flows from investing activities:
Additions to property and equipment	0	0
Proceeds from sale of assets	0	0
Principal receipts from long-term receivables	0	0
Other	0	0
Cash flows provided by investing activities	0	0
Cash flows from financing activities:
Borrowings under revolving credit facilities		0
Repayments under revolving credit facilities		0
Payment of debt	0	0
Payment of debt modification costs	0
Repurchase of common stock	0
Dividends paid on common stock	0
Restricted cash	0	0
Other	0	0
Intercompany transfers	100	(100)
Cash flows used in financing activities	100	(100)
Net change in cash and cash equivalents	100	100
Cash and cash equivalents at beginning of period	600	400
Cash and cash equivalents at end of period	700	500
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	0
Cash flows from investing activities:
Additions to property and equipment	0	0
Proceeds from sale of assets	0	0
Principal receipts from long-term receivables	0	0
Other		0
Cash flows provided by investing activities	0	0
Cash flows from financing activities:
Borrowings under revolving credit facilities		0
Repayments under revolving credit facilities		0
Payment of debt	0	0
Payment of debt modification costs	0
Repurchase of common stock	0
Dividends paid on common stock	0
Restricted cash	0	0
Other	0	0
Intercompany transfers	0	0
Cash flows used in financing activities	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0