Stock-Based Incentive Plans Disclosure of Restricted Stock Units (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Pre-tax compensation expense	$ 10,295	$ 16,291	$ 10,580
Accrued employee compensation and benefits	24,956	22,435
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Multiplier for target award based on total shareholder return on common stock	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Multiplier for target award based on total shareholder return on common stock	200.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period	346,563	486,533	666,244
Beginning of period, weighted average grant date fair value	$ 44.74	$ 31.08	$ 28.62
Granted	97,812	137,852	164,632
Granted, weighted average grant date fair value	$ 73.11	$ 52.23	$ 53.03
Released	(117,075)	(179,465)	(287,735)
Released, weighted average grant date fair value	$ 30.96	$ 13.83	$ 37.82
Forfeited	(61,048)	(98,357)	(56,608)
Forfeited, weighted average grant date fair value	$ 55.37	$ 44.40	$ 31.56
End of period, weighted average grant date fair value	$ 58.87	$ 44.74	$ 31.08
End of period	266,252	346,563	486,533
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period	33,242	18,000	18,000
Beginning of period, weighted average grant date fair value	$ 41.19	$ 29.32	$ 29.32
Granted	15,804	19,152	0
Granted, weighted average grant date fair value	$ 72.04	$ 52.23	$ 0.00
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Unit	37,184
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Units Weighted Average Grant Date Fair Value	$ 72.28
Released	(39,000)	(3,910)	0
Released, weighted average grant date fair value	$ 54.66	$ 40.58	$ 0.00
End of period, weighted average grant date fair value	$ 64.57	$ 41.19	$ 29.32
End of period	47,230	33,242	18,000
Cash Settled Restricted Stock Units Classified as Liabilities | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period	37,184	41,957	26,000
Beginning of period, weighted average grant date fair value	$ 66.13	$ 64.26	$ 64.23
Granted		0	15,957
Granted, weighted average grant date fair value		$ 0.00	$ 64.30
Released	(37,184)	(4,773)	0
Released, weighted average grant date fair value	$ 72.28	$ 49.66	$ 0.00
End of period, weighted average grant date fair value		$ 66.13	$ 64.26
End of period	0	37,184	41,957
Pre-tax compensation expense	300	1,000	500
Accrued employee compensation and benefits	2,400
LTIP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Pre-tax compensation expense	600	3,800	600
Accrued employee compensation and benefits	$ 2,800	$ 4,500
Award vesting period	3 years