Consolidating Financial Information (Supplemental Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	$ 55,992	$ 55,429
Investing cash flows
Additions to property and equipment	(4,086)	(2,953)
Principal receipts from long-term receivables	6,066	7,063
Proceeds from sale of assets	681	0
Other	75	11
Cash flows provided by investing activities	2,736	4,121
Fnancing cash flows
Payment of debt	(7,970)	(7,418)
Payment of debt modification costs	0	(1,281)
Repurchase of common stock	(30,006)	(14,504)
Dividends paid on common stock	(28,518)	(28,885)
Restricted cash	(7,064)	1,564
Other	9,169	2,074
Intercompany transfers	0	0
Cash flows used in financing activities	(64,389)	(48,450)
Net change in cash and cash equivalents	(5,661)	11,100
Cash and cash equivalents at beginning of period	106,011	64,537
Cash and cash equivalents at end of period	100,350	75,637
Parent
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(68,500)	(62,700)
Investing cash flows
Additions to property and equipment	(2,600)	(2,400)
Principal receipts from long-term receivables	0	0
Proceeds from sale of assets	0	0
Other	0	0
Cash flows provided by investing activities	(2,600)	(2,400)
Fnancing cash flows
Payment of debt	(2,400)	(2,400)
Payment of debt modification costs		(1,300)
Repurchase of common stock	(30,000)	(14,500)
Dividends paid on common stock	(28,500)	(28,900)
Restricted cash	0	0
Other	9,100	1,900
Intercompany transfers	117,200	121,200
Cash flows used in financing activities	65,300	76,100
Net change in cash and cash equivalents	(5,700)	11,000
Cash and cash equivalents at beginning of period	50,300	9,900
Cash and cash equivalents at end of period	44,500	20,900
Combined Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	124,600	118,200
Investing cash flows
Additions to property and equipment	(1,500)	(500)
Principal receipts from long-term receivables	6,100	7,100
Proceeds from sale of assets	700	0
Other	100	0
Cash flows provided by investing activities	5,300	6,500
Fnancing cash flows
Payment of debt	(5,500)	(5,000)
Payment of debt modification costs		0
Repurchase of common stock	0	0
Dividends paid on common stock	0	0
Restricted cash	(7,100)	1,600
Other	100	100
Intercompany transfers	(116,800)	(121,300)
Cash flows used in financing activities	(129,300)	(124,600)
Net change in cash and cash equivalents	600	100
Cash and cash equivalents at beginning of period	54,700	54,000
Cash and cash equivalents at end of period	55,300	54,000
Combined Non-guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by (used in) operating activities	(100)	(100)
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	(400)	100
Cash flows used in financing activities	(400)	100
Net change in cash and cash equivalents	(500)	100
Cash and cash equivalents at beginning of period	1,000	600
Cash and cash equivalents at end of period	500	700
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	$ 0