Condensed Consolidating Financial Information Cash Flow (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets			$ 171	$ 125
Non-controlling interest - contributions			(895)	0
ProceedsFromInsuranceRecoveries			884
Payments of Dividends, Noncontrolling Interest			(240)	(181)
Cash and Cash Equivalents, Period Increase (Decrease)			(109,319)	(7,423)
Proceeds from Stock Options Exercised			241	295
Excess Tax Benefit from Share-based Compensation, Financing Activities			2,289	798
Payments of Debt Issuance Costs			(1,094)	0
Settlement of Warrants			(57,777)	0
Net Cash Provided by (Used in) Operating Activities			97,954	111,360
Payments of Dividends			(22,709)	(5,375)
Premiums on life insurance			(1,243)	(921)
Payments for Repurchase of Common Stock			(52,097)	(91,686)
Net Cash Provided by (Used in) Financing Activities			(194,969)	(96,149)
Net Cash Provided by (Used in) Investing Activities			(12,304)	(22,634)
Repayment of debt borrowings			(64,477)	0
Cash and Cash Equivalents, at Carrying Value	24,561	173,622	24,561	173,622	133,880	181,045
Capital expenditures	(7,605)	(6,541)	(11,984)	(12,696)
Payments to Acquire Intangible Assets			(132)	(142)
Payments to Acquire Businesses, Net of Cash Acquired			0	9,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets			137	114
Non-controlling interest - contributions			(895)
ProceedsFromInsuranceRecoveries			884
Payments of Dividends, Noncontrolling Interest			(240)	(181)
Cash and Cash Equivalents, Period Increase (Decrease)			(24,923)	2,060
Proceeds from Stock Options Exercised			0	0
Excess Tax Benefit from Share-based Compensation, Financing Activities			0	0
Payments of Debt Issuance Costs			0
Settlement of Warrants			0
Net Cash Provided by (Used in) Operating Activities			(15,755)	12,047
Payments of Dividends			0	0
Premiums on life insurance			0	0
Payments for Repurchase of Common Stock			0	0
Net Cash Provided by (Used in) Financing Activities			655	(181)
Net Cash Provided by (Used in) Investing Activities			(9,823)	(9,806)
Repayment of debt borrowings			0
Cash and Cash Equivalents, at Carrying Value	9,183	14,059	9,183	14,059	34,106	11,999
Capital expenditures			(10,728)	(9,778)
Payments to Acquire Intangible Assets			(116)	(142)
Payments to Acquire Businesses, Net of Cash Acquired				0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets			0	0
ProceedsFromInsuranceRecoveries			0
Payments of Dividends, Noncontrolling Interest			0	0
Cash and Cash Equivalents, Period Increase (Decrease)			(1,922)	(41,619)
Proceeds from Stock Options Exercised			241	295
Excess Tax Benefit from Share-based Compensation, Financing Activities			2,289	798
Payments of Debt Issuance Costs			0
Settlement of Warrants			(57,777)
Net Cash Provided by (Used in) Operating Activities			128,131	54,349
Payments of Dividends			(22,709)	(5,375)
Premiums on life insurance			0	0
Payments for Repurchase of Common Stock			(52,097)	(91,686)
Net Cash Provided by (Used in) Financing Activities			(130,053)	(95,968)
Net Cash Provided by (Used in) Investing Activities			0	0
Repayment of debt borrowings			0
Cash and Cash Equivalents, at Carrying Value	9,240	32,379	9,240	32,379	11,162	73,998
Capital expenditures			0	0
Payments to Acquire Intangible Assets			0	0
Payments to Acquire Businesses, Net of Cash Acquired				0
Subsidiaries Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets			34	11
ProceedsFromInsuranceRecoveries			0
Payments of Dividends, Noncontrolling Interest			0	0
Cash and Cash Equivalents, Period Increase (Decrease)			(82,474)	32,136
Proceeds from Stock Options Exercised			0	0
Excess Tax Benefit from Share-based Compensation, Financing Activities			0	0
Payments of Debt Issuance Costs			(1,094)
Settlement of Warrants			0
Net Cash Provided by (Used in) Operating Activities			(14,422)	44,964
Payments of Dividends			0	0
Premiums on life insurance			(1,243)	(921)
Payments for Repurchase of Common Stock			0	0
Net Cash Provided by (Used in) Financing Activities			(65,571)	0
Net Cash Provided by (Used in) Investing Activities			(2,481)	(12,828)
Repayment of debt borrowings			(64,477)
Cash and Cash Equivalents, at Carrying Value	6,138	127,184	6,138	127,184	88,612	95,048
Capital expenditures			(1,256)	(2,918)
Payments to Acquire Intangible Assets			(16)	0
Payments to Acquire Businesses, Net of Cash Acquired				9,000
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Sale of Productive Assets			0	0
Non-controlling interest - contributions			0
ProceedsFromInsuranceRecoveries			0
Payments of Dividends, Noncontrolling Interest			0	0
Cash and Cash Equivalents, Period Increase (Decrease)			0	0
Proceeds from Stock Options Exercised			0	0
Excess Tax Benefit from Share-based Compensation, Financing Activities			0	0
Settlement of Warrants			0
Net Cash Provided by (Used in) Operating Activities			0	0
Payments of Dividends			0	0
Premiums on life insurance			0	0
Payments for Repurchase of Common Stock			0	0
Net Cash Provided by (Used in) Financing Activities			0	0
Net Cash Provided by (Used in) Investing Activities			0	0
Repayment of debt borrowings			0
Cash and Cash Equivalents, at Carrying Value	0	0	0	0	0	0
Capital expenditures			0	0
Payments to Acquire Intangible Assets			0	0
Payments to Acquire Businesses, Net of Cash Acquired				$ 0