Stock Compensation Plans and Other Employee Benefit Plans Stock Compensation Plans and Other Employee Benefit Plans (Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Stock Options Outstanding [Roll Forward]
Outstanding at beginning of the period	2,064,534		2,040,701		2,156,209
Granted	250,997		221,003		86,865
Exercised	(484,709)		(85,706)		(159,637)
Forfeited or canceled	(85,395)		(111,464)		(42,736)
Outstanding at end of the period	1,745,427		2,064,534		2,040,701
Exercisable	1,346,287		1,779,218		1,803,298
Vested or expected to vest	1,736,974
Stock Options, Weighted Average Strike Price [Roll Forward]
Outstanding at beginning of the period	$ 38.83		$ 38.92		$ 37.61
Granted	$ 31.16		$ 33.15		$ 33.63
Exercised	$ 21.43		$ 17.20		$ 14.95
Forfeited or canceled	$ 43.70		$ 46.01		$ 51.46
Outstanding at end of the period	$ 42.31		$ 38.83		$ 38.92
Exercisable	$ 45.57		$ 39.93		$ 39.63
Vested or expected to vest	$ 42.37
Stock Options Additional Disclosures
Outstanding, Remaining Contractual Term	3 years 1 month 6 days	[1]	2 years 8 months 12 days	[1]	3 years 3 months 18 days	[1]
Outstanding, Intrinsic Value	$ 3,836	[2]	$ 3,809	[2]	$ 8,028	[2]
Exercisable, Remaining Contractual Term	2 years 3 months 18 days	[1]	2 years 3 months 18 days	[1]	3 years	[1]
Exercisable, Intrinsic Value	$ 1,677	[2]	$ 3,558	[2]	$ 7,368	[2]

[1] Represents the weighted average contractual remaining life in years.

[2] Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Company’s average of the high and low stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. This amount will change based on the fair market value of the Company’s stock.