Stock-Based Incentive Plans - Stock-Based Compensation Expense (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 [Line Items]
Equity classified awards expense	$ 11,000	$ 9,000	$ 9,400
Liability classified awards (credit) expense	(500)	(400)	2,400
Total pre-tax stock-based compensation expense	10,500	8,600	11,800
Book income tax benefit	(3,900)	(3,300)	(4,500)
Total stock-based compensation expense, net of tax	$ 6,600	$ 5,300	$ 7,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning (shares)	504,462	618,115	775,059
Granted (shares)	255,825	133,814	120,932
Excercised (shares)	(48,021)	(218,412)	(256,910)
Forfeited (shares)	(7,924)	(29,055)	(20,966)
Expired (shares)	(3,208)
Outstanding, ending (shares)	701,134	504,462	618,115
Vested and expected to vest (shares)	664,566
Exercisable (shares)	346,710
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average share price, beginning (USD per share)	$ 69.99	$ 53.10	$ 42.09
Weighted average share price, granted (USD per share)	90.90	111.54	81.53
Weighted average share price, exercised (USD per share)	29.33	43.66	31.95
Weighted average share price, forfeited (USD per share)	94.30	99.97	69.18
Weighted average share price, expired (USD per share)	89.17
Weighted average share price, ending (USD per share)	80.04	$ 69.99	$ 53.10
Vested and expected to vest, weighted average exercise price (USD per share)	79.29
Exercisable, weighted average exercise price (USD per share)	$ 65.46
Options, outstanding, weighted average remaining contractual term	7 years 2 months 2 days
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable, weighted average remaining contractual term	7 years 27 days
Excercisable weighted average remaining contractual term	5 years 6 months 9 days
Options, outstanding, intrinsic value	$ 5,646
Options, vested and expected to vest, outstanding, aggregate intrinsic value	5,646
Options, exercisable, intrinsic value	5,646
Total intrinsic value	2,700	$ 12,600	$ 13,200
Cash received from options	1,400	9,500	8,200
Tax benefit realized for tax deduction from option exercises	1,000	$ 4,900	$ 4,300
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 3,800
Unrecognized compensation cost, recognition period	1 year 4 months 22 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 12,800
Unrecognized compensation cost, recognition period	1 year 5 months 4 days

Allocated Share-based Compensation Expense, Equity Classified Awards

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Allocated Share-based Compensation Expense, Liability Classified Awards

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]

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Unrecognized Compensation Cost Related to Options, Expected Recognition Period

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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.

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The amount of expense, net of income tax, 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.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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