Stock-Based Compensation- Stock Option Summary (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Underlying Options	687	901	1,059	1,539
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	1 year 11 months	3 years 4 months 0 days	4 years 0 months 0 days	4 years 8 months 0 days
Options Outstanding, Weighted Average Exercise Price per Share	$ 39.68
Options Exercisable, Number of Shares Underlying Options	687
Options Exercisable, Weighted Average Exercise Price per Share	$ 39.68
Range One Twenty-two Dollars Fifty-one Cent To Seventeen Dollars Fifty Cents [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 22.51
Exercise Price Upper Range Limit	$ 27.50
Options Outstanding, Number of Shares Underlying Options	93
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	0 years 2 months
Options Outstanding, Weighted Average Exercise Price per Share	$ 24.90
Options Exercisable, Number of Shares Underlying Options	93
Options Exercisable, Weighted Average Exercise Price per Share	$ 24.90
Range Two Twenty-seven Dollars Fifty-one Cents To Thirty-five Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 27.51
Exercise Price Upper Range Limit	$ 35.00
Options Outstanding, Number of Shares Underlying Options	202
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	0 years 11 months
Options Outstanding, Weighted Average Exercise Price per Share	$ 31.03
Options Exercisable, Number of Shares Underlying Options	202
Options Exercisable, Weighted Average Exercise Price per Share	$ 31.03
Range Three Thirty-five Dollars One Cent To Forty-one Dollars Seventy-two Cents [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 35.01
Exercise Price Upper Range Limit	$ 41.72
Options Outstanding, Number of Shares Underlying Options	31
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	1 year 4 months
Options Outstanding, Weighted Average Exercise Price per Share	$ 38.33
Options Exercisable, Number of Shares Underlying Options	31
Options Exercisable, Weighted Average Exercise Price per Share	$ 38.33
Range Four Forty-one Dollars Seventy-three Cents To Forty-eight Dollars Forty-five Cents [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 41.73
Exercise Price Upper Range Limit	$ 48.45
Options Outstanding, Number of Shares Underlying Options	361
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	3 years
Options Outstanding, Weighted Average Exercise Price per Share	$ 48.45
Options Exercisable, Number of Shares Underlying Options	0
Options Exercisable, Weighted Average Exercise Price per Share	$ 48.45