Stock-Based Incentive Plans - Disclosure of Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Forfeited, weighted average grant date fair value	$ 101.25	$ 101.55	$ 0.00
Pre-tax compensation expense	$ 10,500	$ 8,600	$ 11,800
Stock-based compensation expense related to LTIP awards	(500)	(400)	$ 2,400
Accrued employee compensation and benefits	$ 14,609	$ 25,085
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
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, Weighted Average Grant Date Fair Value [Abstract]
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 (shares)	(257,594)	(233,818)	(266,252)
Granted (shares)	88,797	138,518	102,618
Released (shares)	(77,712)	(77,042)	(94,798)
Forfeited (shares)	(33,207)	(37,700)	(40,254)
End of period (shares)	(235,472)	(257,594)	(233,818)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning of period, weighted average grant date fair value	$ 89.99	$ 70.14	$ 58.87
Granted, weighted average grant date fair value	88.90	102.78	82.18
Released, weighted average grant date fair value	(78.70)	(54.89)	(53.03)
Forfeited, weighted average grant date fair value	92.82	86.77	67.68
End of period, weighted average grant date fair value	$ 92.91	$ 89.99	$ 70.14
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period (shares)	(35,116)	(41,622)	(47,230)
Granted (shares)	13,053	10,630	13,879
Released (shares)	(14,027)	(16,567)	(19,487)
Forfeited (shares)	(84)	(569)	0
End of period (shares)	(34,058)	(35,116)	(41,622)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning of period, weighted average grant date fair value	$ 86.30	$ 66.92	$ 64.57
Granted, weighted average grant date fair value	90.90	111.72	81.65
Released, weighted average grant date fair value	(72.01)	(52.19)	(70.82)
End of period, weighted average grant date fair value	$ 86.30	$ 86.30	$ 66.92
LTIP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Pre-tax compensation expense			$ 2,400
Award vesting period	3 years
Accrued employee compensation and benefits	$ 1,200	$ 1,600

Allocated Share-based Compensation Expense, Liability Classified Awards

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Released in Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Released in Period, Weighted Average Grant Date Fair Value

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Share Based Compensation, Multiplier for Target Award Based on Total Shareholder Return on Common Stock

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.20)
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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