Equity Level 4 (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Common Stock, Value, Issued	$ 1,233,000		$ 1,233,000		$ 1,233,000
Stock Issued During Period, Value, Stock Options Exercised			83,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			10,176,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			2,353,000
Stock Repurchased During Period, Value			(100,416,000)
Treasury Stock, Shares, Acquired	377,969		742,510
Dividends			(29,508,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax			203,000
Net income	59,942,000	52,951,000	116,674,000	106,881,000
Treasury Stock, Value, Acquired, Cost Method	52,700,000		100,400,000
TreasurySharesAcquiredTaxBurden	20,469		26,333
TreasurySharesAcquiredValueTaxBurden	2,900,000		3,700,000
Cash dividends per share	$ 0.32	$ 0.28	$ 0.64	$ 0.56
Common Stock, Dividends, Per Share, Declared	$ 0.32
Retained Earnings (Accumulated Deficit)	447,612,000		447,612,000		361,255,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8,210,000)		(8,210,000)		(8,413,000)
Treasury Stock, Value	259,432,000		259,432,000		171,845,000
Stockholders' Equity Attributable to Noncontrolling Interest	6,165,000		6,165,000		5,683,000
TOTAL EQUITY	187,478,000		187,478,000		187,913,000
Common Stock [Member]
Common Stock, Value, Issued	1,233,000		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	110,000		110,000		0
Stock Issued During Period, Value, Stock Options Exercised			(1,411,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			(832,000)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			2,353,000
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			(327,000)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			0
Stock Repurchased During Period, Value			0
Dividends			(29,508,000)
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)	447,612,000		447,612,000		361,255,000
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			203,000
Net income			0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8,210,000)		(8,210,000)		(8,413,000)
Treasury Stock [Member]
Stock Issued During Period, Value, Stock Options Exercised			1,494,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			11,335,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			0
Stock Repurchased During Period, Value			(100,416,000)
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	(259,432,000)		(259,432,000)		(171,845,000)
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	$ 6,165,000		$ 6,165,000		$ 5,683,000