Consolidating Financial Information (Supplemental Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 102,427	$ 102,814
Investing cash flows
Additions to property and equipment	(5,530)	(4,547)
Principal receipts from long-term receivables	10,252	10,254
Proceeds from sale of assets	681	0
Other	1	282
Cash flows provided by investing activities	5,404	5,989
Fnancing cash flows
Payment of debt	(12,084)	(9,930)
Payment of debt modification costs	0	(1,296)
Repurchase of common stock	(30,006)	(24,663)
Dividends paid on common stock	(42,733)	(43,170)
Restricted cash	(4,948)	(3,122)
Other	8,788	4,376
Intercompany transfers	0	0
Cash flows used in financing activities	(80,983)	(77,805)
Net change in cash and cash equivalents	26,848	30,998
Cash and cash equivalents at beginning of period	106,011	64,537
Cash and cash equivalents at end of period	132,859	95,535
Parent
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(78,100)	(66,300)
Investing cash flows
Additions to property and equipment	(3,400)	(3,800)
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0	0
Other	0	0
Cash flows provided by investing activities	(3,400)	(3,800)
Fnancing cash flows
Payment of debt	(3,600)	(2,400)
Payment of debt modification costs		(1,300)
Repurchase of common stock	(30,000)	(24,700)
Dividends paid on common stock	(42,700)	(43,200)
Restricted cash	0	0
Other	8,600	4,200
Intercompany transfers	179,200	179,700
Cash flows used in financing activities	111,500	112,400
Net change in cash and cash equivalents	29,900	42,300
Cash and cash equivalents at beginning of period	50,300	9,900
Cash and cash equivalents at end of period	80,200	52,200
Combined Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	180,600	169,400
Investing cash flows
Additions to property and equipment	(2,100)	(700)
Principal receipts from long-term receivables	10,300	10,300
Proceeds from sale of assets	700	0
Other	0	300
Cash flows provided by investing activities	8,800	9,800
Fnancing cash flows
Payment of debt	(8,500)	(7,500)
Payment of debt modification costs		0
Repurchase of common stock	0	0
Dividends paid on common stock	0	0
Restricted cash	(4,900)	(3,100)
Other	200	100
Intercompany transfers	(178,600)	(180,100)
Cash flows used in financing activities	(191,800)	(190,600)
Net change in cash and cash equivalents	(2,400)	(11,400)
Cash and cash equivalents at beginning of period	54,700	54,000
Cash and cash equivalents at end of period	52,300	42,500
Combined Non-guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(100)	(300)
Investing cash flows
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
Fnancing cash flows
Payment of debt	0	0
Payment of debt modification costs		0
Repurchase of common stock	0	0
Dividends paid on common stock	0	0
Restricted cash	0	0
Other	0	0
Intercompany transfers	(600)	400
Cash flows used in financing activities	(600)	400
Net change in cash and cash equivalents	(700)	100
Cash and cash equivalents at beginning of period	1,000	600
Cash and cash equivalents at end of period	300	800
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	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	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