Stock-Based Incentive Plans - Stock-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compenation, equity classified awards	$ 9,000	$ 9,400	$ 9,400
Stock-based compensation, liability classified awards	(400)	2,400	900
Total pre-tax stock-based compensation expense	8,600	11,800	10,300
Book tax benefit	(3,300)	(4,500)	(3,900)
Total stock-based compensation expense, net of tax	$ 5,300	$ 7,300	$ 6,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning	618,115	775,059	958,246
Granted	133,814	120,932	81,328
Excercised	(218,412)	(256,910)	(225,272)
Forfeited	(29,055)	(20,966)	(39,243)
Outstanding, Ending	504,462	618,115	775,059
Vested and Expected to Vest	485,616
Exercisable	310,543
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Avg Share Prince, Beginning	$ 53.10	$ 42.09	$ 39.67
Weighted Avg Share Price, Granted	111.54	81.53	72.28
Weighted Avg Share Price, Exercised	43.66	31.95	40.31
Weighted Avg Share Price, Forfeited	99.97	69.18	55.78
Weighted Avg Share Prince, Ending	69.99	$ 53.10	$ 42.09
Vested and expected to vest, weighted avg share price	68.71
Exercisable, weighted avg share price	$ 52.56
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	6 years 7 months 28 days
Excercisable Weighted Average Remaining Contractual Term	5 years 6 months 17 days
Options, Outstanding, Intrinsic Value	$ 10,499
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	10,481
Options, Exercisable, Intrinsic Value	10,073
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	12,600	$ 13,200	$ 7,500
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	9,500	8,200	9,100
Tax Benefit from Stock Options Exercised	4,900	$ 4,300	$ 3,700
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	$ 3,200
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 4 months 20 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	$ 13,900
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 7 months 27 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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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 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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