Stock-Based Compensation (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended
	Feb. 20, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 23, 2014 Restricted Stock [Member]	Feb. 20, 2014 Restricted Stock [Member]	Feb. 20, 2014 Restricted Stock Units (RSUs) [Member]	Feb. 20, 2014 Performance Shares [Member]	Feb. 20, 2014 Earnings Per Share [Member] Performance Shares [Member]	Feb. 20, 2014 Total Shareholder Return [Member] Performance Shares [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period (in shares)				271,902		18,240	45,168	161,024	47,470	23,735	23,735
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 56.84		$ 49.36	$ 55.35			$ 55.35	$ 77.00
Stock-based compensation		$ 2,109,000	$ 3,918,000	$ 13,480,000	$ 16,867,000
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost				2,500,000	4,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 14,600,000		$ 14,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				23 months 20 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.69%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	24.80%