Share-Based Compensation Share-Based Compensation (Details Textual) (USD $)	0 Months Ended	12 Months Ended				1 Months Ended		12 Months Ended	1 Months Ended		12 Months Ended				12 Months Ended							12 Months Ended
	Oct. 25, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2013 Restricted Stock (RSU)	Feb. 28, 2012 Restricted Stock (RSU)	Dec. 31, 2013 Restricted Stock (RSU)	Jan. 31, 2012 PBRS	Jan. 31, 2011 PBRS	Dec. 31, 2013 PBRS	Dec. 31, 2012 PBRS	Dec. 31, 2011 PBRS	Dec. 31, 2010 PBRS	Dec. 31, 2013 Performance unit incentive plan (PUP)	Dec. 31, 2012 Performance unit incentive plan (PUP)	Dec. 31, 2011 Performance unit incentive plan (PUP)	Dec. 31, 2013 Restricted Stock	Dec. 31, 2012 Restricted Stock	Dec. 31, 2011 Restricted Stock	Dec. 31, 2010 Restricted Stock	Dec. 31, 2013 Restricted Stock Units and Performance Based Restricted Stock Units	Dec. 31, 2012 Restricted Stock Units and Performance Based Restricted Stock Units	Dec. 31, 2011 Restricted Stock Units and Performance Based Restricted Stock Units	Dec. 31, 2013 Employee Stock Option [Member]	Dec. 31, 2012 Employee Stock Option [Member]	Dec. 31, 2011 Employee Stock Option [Member]	Dec. 31, 2013 Restructuring Charges	Dec. 31, 2012 Restructuring Charges	Dec. 31, 2011 Restructuring Charges	Dec. 31, 2013 Restructuring Charges Restricted Stock (RSU)	Dec. 31, 2013 Restructuring Charges Performance unit incentive plan (PUP)	Dec. 31, 2012 Restructuring Charges Performance unit incentive plan (PUP)	Dec. 31, 2013 Performance Based Restricted Stock Units [Member]	Dec. 31, 2012 Performance Unit Incentive Plan [Member]	Dec. 31, 2013 Performance Unit Incentive Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number											0	0	416	18,830				430,899	516,351	572,022	478,499
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value											$ 0.00	$ 0.00	$ 15.36	$ 33.02				$ 22.78	$ 21.25	$ 20.36	$ 21.51
Share Based Compensation (Textual) [Abstract]
Useful Life of the 2007 plan		10 years
Minimum number of shares of common stock available for grant		1,700,000
Additional number of shares of common stock available for grant		1,500,000
Shares Available for Grant		983,971
Share-based compensation before income tax benefit		$ 5,221,000	$ 7,232,000	$ 4,413,000											$ 1,864,000	$ 2,922,000	$ 714,000					$ 177,000	$ 450,000	$ 120,000	$ 107,000	$ 593,000	$ 537,000	$ 676,000	$ 253,000	$ 124,000	$ 154,000	$ 329,000	$ 94,000
Grant date fair value of restricted stock vested												6,000	600,000					3,500,000	4,000,000	2,900,000
Unamortized cost																		3,200,000
Recognition Period of Unrecognized cost																		1 year 8 months 12 days
Repurchase of Common Stock for Employee Tax Withholding Obligations amount, shares		50,156	56,885	28,627
Repurchase of Common Stock for Employee Tax Withholding Obligations amount		1,300,000	1,100,000	679,000
Liabilities related to restricted stock																						664,000	633,000
Payments To Employees						300,000	257,000		35,000	52,000					0	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized																									0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	0	0
Liability awards recorded			3,700,000																																	5,900,000
Weighted-average exercised		$ 19.79	$ 22.03	$ 23.32	$ 23.38
Effective vesting date																																		Dec. 31, 2009
PUP award cancelled											0	0	0					20,432	4,150	7,115
PUP awards, Granted											0	0	0					101,300	168,050	191,850
PUP award vested											0	416	18,414					166,320	219,571	91,212															0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value											$ 0.00	$ 15.36	$ 33.42					$ 20.83	$ 18.26	$ 31.31
Options Exercised		59,543	12,099	14,616
Capitalized share-based compensation costs		0	0	0
Grant date fair value of restricted stock vested								$ 27.35			$ 0.00	$ 0.00	$ 0.00					$ 27.27	$ 20.46	$ 22.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value											$ 0.00	$ 0.00	$ 0.00					$ 22.13	$ 24.80	$ 20.81
Common Stock, Dividends, Per Share, Declared	$ 2.50	$ 2.90	$ 0.28	$ 0.16
Dividends, Common Stock	$ 50,800,000