Share-Based Compensation (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended			6 Months Ended								3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended			6 Months Ended				6 Months Ended
	Dec. 08, 2010	Mar. 21, 2008	Dec. 31, 2011 days	Dec. 31, 2010	Dec. 31, 2011 days	Dec. 31, 2010	Jun. 30, 2011	Mar. 06, 2011	Feb. 06, 2008	Dec. 31, 2011 Restricted Stock [Member] years	Dec. 31, 2011 Restricted Stock Units RSUs [Member] years	Dec. 31, 2011 Restricted Stock Units RSUs With Market Conditions [Member]	Dec. 31, 2010 Restricted Stock Units RSUs With Market Conditions [Member]	Dec. 31, 2010 Restricted Stock Units RSUs With Performance Conditions [Member]	Dec. 31, 2008 Restricted Stock Units RSUs With Performance Conditions [Member]	Dec. 31, 2011 Restricted Stock Units With Earning Per Share Performance Conditions [Member]	Dec. 31, 2011 Restricted Stock Units With Return On Invested Capital Performance Conditions [Member]	Dec. 31, 2010 Monte Carlo Simulation And Lattice-Based Models [Member]	Dec. 31, 2011 Monte Carlo Simulation And Lattice-Based Models [Member]	Dec. 31, 2010 Monte Carlo Simulation And Lattice-Based Models [Member]	Dec. 31, 2011 2012 Plan [Member]	Dec. 31, 2011 2012 Plan [Member]	Dec. 31, 2011 2012 Plan [Member] Restricted Stock Units RSUs [Member]	Dec. 31, 2011 2012 Plan [Member] Restricted Stock Units RSUs [Member]	Dec. 31, 2011 Outside 2002 Plan [Member] Restricted Stock [Member]	Jan. 31, 2008 Outside 2002 Plan [Member] Restricted Stock Units RSUs [Member]	Sep. 30, 2008 Outside 2002 [Member] Restricted Stock Units RSUs [Member]	Dec. 31, 2011 2002 Plan [Member]	Dec. 31, 2009 2002 Plan [Member]	Dec. 31, 2011 2002 Plan [Member] Restricted Stock [Member]	Dec. 31, 2011 2002 Plan [Member] Restricted Stock Units RSUs [Member]	Dec. 31, 2010 2002 Plan [Member] Restricted Stock Units RSUs [Member]	Dec. 31, 2009 2002 Plan [Member] Restricted Stock Units RSUs With Performance Conditions [Member]	Dec. 31, 2011 Maximum [Member] Restricted Stock [Member]	Dec. 31, 2011 Full Value Grant [Member] 2012 Plan [Member]	Dec. 31, 2011 Option Or Stock Appreciation Right Grant [Member] 2012 Plan [Member]
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, maturity date																						December 7, 2021
Shares available for grant																					4,400,000	4,400,000
Reduction in shares available for grant for one award under the plan																																			1.71	1
Share-based compensation			$ 5,400,000	$ 5,000,000	$ 7,921,000	$ 9,331,000												$ 400,000		$ 700,000
Total income tax benefit recognized			1,500,000	1,500,000	2,200,000	2,600,000
Number of shares increased for grant of stock options, stock appreciation rights, restricted stock and restricted stock units	1,100,000
Grant of stock options stock appreciation rights restricted stock and restricted stock units not to exceed for shares of common stock	7,860,000
Shares, outstanding										18,000
Shares granted under the 2002 plan																														15,000
Weighted-average grant-date fair value			$ 14.12	$ 18.13	$ 13.26	$ 14.75
Grant date fair value					4,200,000
Total intrinsic value of options exercised			700,000	900,000	900,000	1,000,000
Extended vesting period after employee termination, days					90
Stock options granted		330,470			490,775																36,125	36,125	8,412	8,412	3,000			454,630			645,558
Base price to be used for the TSR calculation									$ 42.19
Trading period, in days			20		20
Ending price used for TSR calculation								$ 49.81
Total unrecognized compensation cost											30,800,000																							100,000
Weighted average recognition period, years										0.2	1.7
Number of restricted stock units settled					1,608	9,647
Restricted stock units settled cost					100,000	300,000
Restricted stock units granted												118,546	191,715	191,721	133,507	118,546	118,546									34,608	28,344				298,332	328,788	380,400
Cliff vesting period, in years																													3
Restricted stock units, grant date fair value																			3,300,000	5,200,000
Award vesting period, years																												3
Aggregate intrinsic value of equity classified restricted stock											$ 10,000,000
Cash-settled restricted stock units, outstanding					1,608		3,216