Consolidating Financial Information Supplemental Condensed Consolidating Statement of Cash Flows (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 71,226,000	$ 44,693,000
Additions to property and equipment	(1,495,000)	(4,150,000)
Principal receipts from long-term receivables	3,810,000	3,437,000
Proceeds from sale of assets	0	21,390,000
Other	68,000	699,000
Cash flows provided by investing activities	2,383,000	21,376,000
Payment of debt	(3,700,000)	(79,000,000)
Payment of debt issuance costs	(1,282,000)	0
Purchase of common stock	0
Dividends paid on common stock	(14,512,000)	0
Restricted cash	(2,681,000)	(2,639,000)
Other	1,400,000	3,600,000
Intercompany transfers	0	0
Cash flows used in financing activities	(20,764,000)	(78,076,000)
Net change in cash and cash equivalents	52,845,000	(12,007,000)
Cash and cash equivalents at beginning of period	64,537,000	60,691,000
Cash and cash equivalents at end of period	117,382,000	48,684,000
Parent
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(14,500,000)	(15,000,000)
Additions to property and equipment	(900,000)	(1,300,000)
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0	0
Other	0	0
Cash flows provided by investing activities	(900,000)	(1,300,000)
Payment of debt	(1,200,000)	(76,000,000)
Payment of debt issuance costs	(1,300,000)
Purchase of common stock	0
Dividends paid on common stock	(14,512,000)
Restricted cash	0	0
Other	1,300,000	3,100,000
Intercompany transfers	74,000,000	87,000,000
Cash flows used in financing activities	58,200,000	14,100,000
Net change in cash and cash equivalents	42,900,000	(2,200,000)
Cash and cash equivalents at beginning of period	9,900,000	9,900,000
Cash and cash equivalents at end of period	52,800,000	7,700,000
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	85,500,000	59,800,000
Additions to property and equipment	(600,000)	(2,800,000)
Principal receipts from long-term receivables	0	3,400,000
Proceeds from sale of assets	3,800,000	21,400,000
Other	100,000	700,000
Cash flows provided by investing activities	3,300,000	22,700,000
Payment of debt	(2,500,000)	(3,000,000)
Payment of debt issuance costs	0
Purchase of common stock	0
Dividends paid on common stock	0
Restricted cash	(2,700,000)	(2,600,000)
Other	100,000	400,000
Intercompany transfers	(74,000,000)	(87,500,000)
Cash flows used in financing activities	(79,000,000)	(92,700,000)
Net change in cash and cash equivalents	9,700,000	(10,200,000)
Cash and cash equivalents at beginning of period	54,000,000	50,400,000
Cash and cash equivalents at end of period	63,700,000	40,200,000
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	200,000	(100,000)
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0	0
Other	0	0
Cash flows provided by investing activities	0	0
Payment of debt	0	0
Payment of debt issuance costs	0
Purchase of common stock	0
Dividends paid on common stock	0
Restricted cash	0	0
Other	0	0
Intercompany transfers	0	500,000
Cash flows used in financing activities	0	500,000
Net change in cash and cash equivalents	200,000	400,000
Cash and cash equivalents at beginning of period	600,000	400,000
Cash and cash equivalents at end of period	900,000	800,000
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	0
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0	0
Other	0	0
Cash flows provided by investing activities	0	0
Payment of debt	0	0
Payment of debt issuance costs	0
Purchase 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