Consolidating Financial Information (Supplemental Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 52,840	$ 71,226
Investing cash flows
Additions to property and equipment	(2,039)	(1,495)
Principal receipts from long-term receivables	3,415	3,810
Proceeds from sale of assets	681	0
Other	(55)	68
Cash flows provided by investing activities	2,002	2,383
Fnancing cash flows
Payment of debt	(3,895)	(3,683)
Payment of debt modification costs	0	(1,282)
Repurchase of common stock	(15,002)	0
Dividends paid on common stock	(14,293)	(14,512)
Restricted cash	(3,692)	(2,681)
Other	9,247	1,394
Intercompany transfers	0	0
Cash flows used in financing activities	(27,635)	(20,764)
Net change in cash and cash equivalents	27,207	52,845
Cash and cash equivalents at beginning of period	106,011	64,537
Cash and cash equivalents at end of period	133,218	117,382
Parent
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(22,800)	(14,500)
Investing cash flows
Additions to property and equipment	(1,300)	(900)
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0
Other	0	0
Cash flows provided by investing activities	(1,300)	(900)
Fnancing cash flows
Payment of debt	(1,200)	(1,200)
Payment of debt modification costs		(1,300)
Repurchase of common stock	(15,000)
Dividends paid on common stock	(14,300)	(14,500)
Restricted cash	0	0
Other	9,200	1,300
Intercompany transfers	60,900	74,000
Cash flows used in financing activities	39,600	58,200
Net change in cash and cash equivalents	15,500	42,900
Cash and cash equivalents at beginning of period	50,300	9,900
Cash and cash equivalents at end of period	65,800	52,800
Combined Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	75,600	85,500
Investing cash flows
Additions to property and equipment	(700)	(600)
Principal receipts from long-term receivables	3,400	3,800
Proceeds from sale of assets	700
Other	(100)	100
Cash flows provided by investing activities	3,300	3,300
Fnancing cash flows
Payment of debt	(2,700)	(2,500)
Payment of debt modification costs		0
Repurchase of common stock	0
Dividends paid on common stock	0	0
Restricted cash	(3,700)	(2,700)
Other	100	100
Intercompany transfers	(60,500)	(74,000)
Cash flows used in financing activities	(66,900)	(79,000)
Net change in cash and cash equivalents	12,100	9,700
Cash and cash equivalents at beginning of period	54,700	54,000
Cash and cash equivalents at end of period	66,800	63,700
Combined Non-guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	200
Investing cash flows
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0
Other	0	0
Cash flows provided by investing activities	0	0
Fnancing cash flows
Payment of debt	0	0
Payment of debt modification costs		0
Repurchase of common stock	0
Dividends paid on common stock	0	0
Restricted cash	0	0
Other	0	0
Intercompany transfers	(400)	0
Cash flows used in financing activities	(400)	0
Net change in cash and cash equivalents	(400)	200
Cash and cash equivalents at beginning of period	1,000	600
Cash and cash equivalents at end of period	600	900
Eliminations and Reclassification
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	0	0
Investing cash flows
Additions to property and equipment	0	0
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0
Other	0	0
Cash flows provided by investing activities	0	0
Fnancing cash flows
Payment of debt	0	0
Payment of debt modification costs		0
Repurchase of common stock	0
Dividends paid on common stock	0	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