Share-Based Compensation (Stock Option Activity) (Details)	9 Months Ended
Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average fair value of options granted	$ 8.40
Stock Options [Member] \| Non Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number of Options \| shares	432,199
Granted, Number of Options \| shares	244,165
Converted, Number of Options from Lake Michigan Acquisition \| shares	0.00
Exercised, Number of Options \| shares	0
Vested, Number of Options \| shares	(150,224)
Forfeited/expired, Number of Options \| shares	(38,342)
Ending balance, Number of Options \| shares	487,798
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance, Weighted Average Exercise Price	$ 26.75
Granted, Weighted Average Exercise Price	30.18
Converted options from Lake Michigan acquisition, Weighted Average Exercise Price	0.00
Exercised, Weighted Average Exercise Price	0.00
Vested, Weighted Average Exercise Price	25.57
Forfeited/expired, Weighted Average Exercise Price	27.98
Ending balance, Weighted Average Exercise Price	28.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance, Weighted average grant date fair value	8.30
Weighted average fair value of options granted	8.40
Converted options from Lake Michigan acquisition, Wtd Avg Grant Date Fair Value	0.00
Exercised, Weighted Average Grant Date Fair Value	0.00
Vested, Weighted Average Grant Date Fair Value	7.80
Forfeited/expired, Weighted Average Grant Date Fair Value	8.49
Ending balance, Weighted average grant date fair value	$ 8.49
Stock Options [Member] \| Vested & Nonvested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number of Options \| shares	1,037,311
Granted, Number of Options \| shares	244,165
Converted, Number of Options from Lake Michigan Acquisition \| shares	132,883
Exercised, Number of Options \| shares	(233,333)
Vested, Number of Options \| shares	0
Forfeited/expired, Number of Options \| shares	(38,942)
Ending balance, Number of Options \| shares	1,142,084
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance, Weighted Average Exercise Price	$ 25.90
Granted, Weighted Average Exercise Price	30.18
Converted options from Lake Michigan acquisition, Weighted Average Exercise Price	12.93
Exercised, Weighted Average Exercise Price	23.68
Vested, Weighted Average Exercise Price	0.00
Forfeited/expired, Weighted Average Exercise Price	28.05
Ending balance, Weighted Average Exercise Price	$ 25.68
Stock Options [Member] \| Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Exercisable/vested, Number of Options \| shares	654,286
Exercisable/vested, Weighted Average Exercise Price	$ 23.41

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Share based compensation arrangement by share based payment award, option, vested and expected to vest, outstanding number.

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Share-based compensation arrangement by share-based payment award, options, exercises in period, weighted average grant date fair value.

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Share-based compensation arrangement by share-based payment award, options, vested in period, weighted average grant date fair value.

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Share based compensation arrangements by share based payment award, options, forfeitures and expirations in period, weighted average grant date fair value.

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- Definition

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.

+ References

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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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- Definition

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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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

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