Stock-Based Incentive Plans - Stock-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity classified awards expense	$ 10,600	$ 10,900	$ 11,000
Liability classified awards (credit)	3,100	(1,000)	(500)
Total pretax stock-based compensation expense	13,700	9,900	10,500
Book income tax benefit	(3,500)	(3,800)	(3,900)
Total stock-based compensation expense, net of tax	$ 10,200	$ 6,100	$ 6,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning (shares)	1,272,048	701,134	504,462
Granted (shares)	248,899	887,030	255,825
Excercised (shares)	(74,930)	(64,916)	(48,021)
Forfeited (shares)	(6,309)	(171,847)	(7,924)
Expired (shares)	0	(79,353)	(3,208)
Outstanding, ending (shares)	1,439,708	1,272,048	701,134
Vested and expected to vest (shares)	1,301,066
Exercisable (shares)	571,768
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)	$ 61.44	$ 80.04	$ 69.99
Weighted average share price, granted (USD per share)	69.12	48.35	90.90
Weighted average share price, exercised (USD per share)	52.43	40.59	29.33
Weighted average share price, forfeited (USD per share)	68.80	65.82	94.30
Weighted average share price, expired (USD per share)	0.00	87.02	89.17
Weighted average share price, ending (USD per share)	63.21	$ 61.44	$ 80.04
Vested and expected to vest, weighted average exercise price (USD per share)	64.62
Exercisable, weighted average exercise price (USD per share)	$ 77.73
Options, outstanding, weighted average remaining contractual term	6 years 7 months 18 days
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable, weighted average remaining contractual term	6 years 4 months 28 days
Excercisable weighted average remaining contractual term	3 years 6 months 29 days
Options, outstanding, intrinsic value	$ 15,900
Options, vested and expected to vest, outstanding, aggregate intrinsic value	13,400
Options, exercisable, intrinsic value	2,900
Total intrinsic value	2,400	$ 1,400	$ 2,700
Proceeds from stock options exercised	3,928	2,635	1,409
Tax benefit realized for tax deduction from option exercises	600	$ 500	$ 1,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 3,600
Unrecognized compensation cost, recognition period	1 year 6 months 6 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 19,100
Unrecognized compensation cost, recognition period	1 year 8 months 29 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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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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