Equity Level 4 (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Common Stock, Value, Issued	$ 1,376,000		$ 1,376,000		$ 1,376,000
Stock Issued During Period, Value, Stock Options Exercised			5,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			8,903,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			3,466,000
Stock Repurchased During Period, Value			(50,160,000)
Treasury Stock, Shares, Acquired	299,104		403,383
Dividends			(26,624,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax			27,000
Net income	52,951,000	40,384,000	106,881,000	86,376,000
Treasury Stock, Value, Acquired, Cost Method	37,300,000		50,200,000
TreasurySharesAcquiredTaxBurden	32,311		38,590
TreasurySharesAcquiredValueTaxBurden	4,200,000		4,900,000
Cash dividends per share	$ 0.28	$ 0.25	$ 0.56	$ 0.50
Common Stock, Dividends, Per Share, Declared	$ 0.28
Retained Earnings (Accumulated Deficit)	363,903,000		363,903,000		283,660,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,712,000)		(1,712,000)		(1,739,000)
Treasury Stock, Value	149,088,000		149,088,000		107,406,000
Stockholders' Equity Attributable to Noncontrolling Interest	3,766,000		3,766,000		3,752,000
TOTAL EQUITY	224,153,000		224,153,000		181,655,000
Common Stock [Member]
Common Stock, Value, Issued	1,376,000		1,376,000		1,376,000
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	5,908,000		5,908,000		2,012,000
Stock Issued During Period, Value, Stock Options Exercised			(60,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			490,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			3,466,000
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			(26,624,000)
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)	363,903,000		363,903,000		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
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax			27,000
Net income			0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,712,000)		(1,712,000)		(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			8,413,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			0
Stock Repurchased During Period, Value			(50,160,000)
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	(149,088,000)		(149,088,000)		(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
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	$ 3,766,000		$ 3,766,000		$ 3,752,000