Equity - Schedule of Stock Options, SARS, and Non-vested Restricted Stock (Details) - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Outstanding, Beginning number of Stock Options and SARS	747,573	718,143	664,245
Outstanding, Beginning Stock Options and SARS - Weighted Average Exercise Price	$ 30.18	$ 26.68	$ 25.12
Granted, Stock Options and SARS	51,975	119,110	87,600
Granted Stock Options and SARS, Weighted Average Exercise Price	$ 35.75	$ 32.25	$ 34.92
Exercised, Stock Options and SARs	431,346	86,680	23,035
Exercised Stock Options and SARs, Weighted Average Exercise Price	$ 24.77	$ 21.32	$ 20.83
Canceled Stock Options and SARs	667	3,000	10,667
Canceled Stock Options and SARs, Weighted Average Exercise Price	$ 35.60	$ 30.05	$ 31.16
Outstanding, Ending number of Stock Options and SARS	367,535	747,573	718,143
Outstanding, Ending Stock Options and SARS - Weighted Average Exercise Price	$ 26.68	$ 25.12	$ 23.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	208,274	543,698	548,180
Exercisable Stock Options and SARS, End of Year, Weighted Average Exercise Price	$ 27.41	$ 24.34	$ 23.12
Outstanding, Ending Number of Non-Vested RSU	132,651	103,772	98,285
Outstanding, Beginning Number of Non-Vested RSU	138,497	132,651	103,772
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 34.63	$ 32.12	$ 31.24	$ 27.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	76,617	76,616	57,590
Restricted Stock Awarded, Weighted Average Grant Date Fair Value	$ 36.33	$ 32.14	$ 33.88
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	1,360	0	8,360
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 35.75	$ 0.00	$ 21.72
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	69,411	47,737	43,743
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 31.69	$ 30.25	$ 28.48

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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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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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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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

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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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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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

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