Equity Level 4 (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Sep. 30, 2012
Common Stock, Value, Issued	$ 1,233,000		$ 1,233,000
Stock Issued During Period, Value, Stock Options Exercised	35,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	5,138,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	553,000
Stock Repurchased During Period, Value	(47,745,000)
Treasury Stock, Shares, Acquired	364,541
Dividends	(14,820,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	101,000
Net income	56,732,000	53,930,000
Treasury Stock, Value, Acquired, Cost Method	47,700,000
TreasurySharesAcquiredTaxBurden	5,864
TreasurySharesAcquiredValueTaxBurden	800,000
Cash dividends per share	$ 0.32	$ 0.28
Common Stock, Dividends, Per Share, Declared	$ 0.32
Retained Earnings (Accumulated Deficit)	402,951,000		361,255,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8,312,000)		(8,413,000)
Treasury Stock, Value	216,214,000		171,845,000
Stockholders' Equity Attributable to Noncontrolling Interest	5,899,000		5,683,000
TOTAL EQUITY	187,907,000		187,913,000	187,907,000
Common Stock [Member]
Common Stock, Value, Issued			1,233,000	1,233,000
Stock Issued During Period, Value, Stock Options Exercised	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0
Stock Repurchased During Period, Value	0
Dividends	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0
Net income	0
Additional Paid-in Capital [Member]
Additional Paid in Capital			0	2,350,000
Stock Issued During Period, Value, Stock Options Exercised	(951,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	2,748,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	553,000
Stock Repurchased During Period, Value	0
Dividends	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0
Net income	0
Retained Earnings [Member]
Stock Issued During Period, Value, Stock Options Exercised	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0
Stock Repurchased During Period, Value	0
Dividends	(14,820,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0
Retained Earnings (Accumulated Deficit)			361,255,000	402,951,000
Accumulated Other Comprehensive Income (Loss) [Member]
Stock Issued During Period, Value, Stock Options Exercised	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0
Stock Repurchased During Period, Value	0
Dividends	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	101,000
Net income	0
Accumulated Other Comprehensive Income (Loss), Net of Tax			(8,413,000)	(8,312,000)
Treasury Stock [Member]
Stock Issued During Period, Value, Stock Options Exercised	986,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	2,390,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0
Stock Repurchased During Period, Value	(47,745,000)
Dividends	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0
Net income	0
Treasury Stock, Value			(171,845,000)	(216,214,000)
Noncontrolling Interest [Member]
Stock Issued During Period, Value, Stock Options Exercised	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0
Stock Repurchased During Period, Value	0
Dividends	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0
Stockholders' Equity Attributable to Noncontrolling Interest			$ 5,683,000	$ 5,899,000