Equity Level 4 (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Common Stock, Value, Issued	$ 1,233,000		$ 1,233,000		$ 1,262,000
Stock Issued During Period, Value, Stock Options Exercised			5,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			13,503,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			3,479,000
Stock Repurchased During Period, Value			(83,350,000)
Treasury Stock, Shares, Acquired	283,513		686,896
Dividends			(39,876,000)
Stock Repurchased and Retired During Period, Value			0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(54,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax			40,000
Net income	54,549,000	45,109,000	161,430,000	131,485,000
Treasury Stock, Value, Acquired, Cost Method	33,200,000		83,400,000
TreasurySharesAcquiredTaxBurden	3,513		42,103
TreasurySharesAcquiredValueTaxBurden	400,000		5,300,000
Treasury Stock, Shares, Retired			1,138,224
Cash dividends per share	$ 0.28	$ 0.25	$ 0.84	$ 0.75
Common Stock, Dividends, Per Share, Declared	$ 0.28
Retained Earnings (Accumulated Deficit)	326,058,000		326,058,000		283,660,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,699,000)		(1,699,000)		(1,739,000)
Treasury Stock, Value	94,380,000		94,380,000		107,406,000
Stockholders' Equity Attributable to Noncontrolling Interest	3,858,000		3,858,000		3,752,000
TOTAL EQUITY	236,832,000		236,832,000		181,655,000
Common Stock [Member]
Common Stock, Value, Issued	1,233,000		1,233,000		1,262,000
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
Stock Repurchased and Retired During Period, Value			(29,000)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			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	1,762,000		1,762,000		2,126,000
Stock Issued During Period, Value, Stock Options Exercised			(60,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			3,785,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			3,479,000
Stock Repurchased During Period, Value			0
Dividends			0
Stock Repurchased and Retired During Period, Value			(7,568,000)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			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			(39,876,000)
Stock Repurchased and Retired During Period, Value			(78,996,000)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			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
Retained Earnings (Accumulated Deficit)	326,058,000		326,058,000		283,660,000
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
Stock Repurchased and Retired During Period, Value			0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			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			40,000
Net income			0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,699,000)		(1,699,000)		(1,739,000)
Treasury Stock [Member]
Stock Issued During Period, Value, Stock Options Exercised			65,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			9,718,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			0
Stock Repurchased During Period, Value			(83,350,000)
Dividends			0
Stock Repurchased and Retired During Period, Value			86,593,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			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	(94,380,000)		(94,380,000)		(107,406,000)
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
Stock Repurchased and Retired During Period, Value			0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(54,000)
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
Stockholders' Equity Attributable to Noncontrolling Interest	$ 3,858,000		$ 3,858,000		$ 3,752,000