Stock-Based Incentive Plans Stock-Based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compenation, equity classified awards	$ 9,444,000	$ 11,442,000	$ 9,492,000
Stock-based compenation, liability classified awards	851,000	4,849,000	1,088,000
Pre-tax compensation expense	10,295,000	16,291,000	10,580,000
Book tax benefit	(3,912,000)	(6,158,000)	(4,206,000)
Total stock-based compensation expense, net of tax	6,383,000	10,133,000	6,374,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning	958,246	1,318,640	1,523,710
Granted	81,328	147,674	233,449
Excercised	(225,272)	(455,217)	(393,075)
Forfeited	(39,243)	(39,381)	(42,593)
Expired		(13,470)	(2,851)
Outstanding, Ending	775,059	958,246	1,318,640
Vested and Expected to Vest	758,338
Exercisable	567,630
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Avg Share Prince, Beginning	$ 39.67	$ 32.06	$ 24.90
Weighted Avg Share Price, Granted	$ 72.28	$ 51.63	$ 53.04
Weighted Avg Share Price, Exercised	$ 40.31	$ 20.91	$ 17.11
Weighted Avg Share Price, Forfeited	$ 55.78	$ 46.97	$ 27.89
Weighted Avg Share Price, Expired		$ 38.64	$ 47.08
Weighted Avg Share Prince, Ending	$ 42.09	$ 39.67	$ 32.06
Vested and expected to vest, weighted avg share price	$ 41.64
Exercisable, weighted avg share price	$ 35.91
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 11 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	6 years 2 months 23 days
Excercisable Weighted Average Remaining Contractual Term	5 years 6 months 18 days
Options, Outstanding, Intrinsic Value	32,100,000
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	31,800,000
Options, Exercisable, Intrinsic Value	27,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	7,500,000	15,000,000	14,600,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	9,100,000	9,300,000	6,700,000
Tax Benefit from Stock Options Exercised	3,700,000	6,200,000	5,800,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	4,100,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 6 months 25 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 8,200,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 9 months 29 days