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Restricted Stock Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award, issued during period	1,025,107
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, number of shares authorized	2,000,000
Share-based payment award, limitation on single participant award	50.00%
Unrecognized compensation expense	$ 3.4
Unrecognized compensation expense, recognition weighted average period	2 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares outstanding at beginning of year	433,382	359,306	1,078,628
Nonvested restricted shares granted	274,172	137,026	654,120
Nonvested restricted shares forfeited	(42,711)	0	(7,000)
Shares vested	(346,282)	(62,950)	(1,366,442)
Nonvested restricted shares outstanding at end of year	318,561	433,382	359,306
Weighted Average Grant Date Fair Value, Outstanding at beginning of year	$ 18.94	$ 13.79	$ 10.45
Weighted Average Grant Date Fair Value, Granted	$ 36.47	$ 29.56	$ 11.47
Weighted Average Grant Date Fair Value, Forfeited	$ 33.71	$ 0.00	$ 10.40
Weighted Average Grant Date Fair Value, Vested	$ 15.33	$ 12.84	$ 10.06
Weighted Average Grant Date Fair Value, Outstanding at end of year	$ 35.82	$ 18.94	$ 13.79
Restricted Stock Performance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares granted	159,940	177,034	123,026
Compensation expense	$ 2.9	$ 6.2	$ 3.3

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Limitation on Single Participant Award, Percentage of shares authorized to be issued uder the Plan.

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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