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Stock-Based Compensation Restricted Stock Units (Details) - Jun. 30, 2015 $ in Millions	USD ($) years shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive shares granted	379,000
Incentive shares ouststanding Aggregate Intrinsic Value (in millions) | $	$ 28.3
Director restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $	0.9
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs | $	6.1
Compensation Expense | $	$ 1.7
Incentive share awards outstanding at January 1, 2015	593,613
Incentive shares granted	250,129
Incentive share awards vested	(273,995)
Incentive share awards canceled	(15,083)
Incentive shares outstanding at June 30, 2015	554,664
Incentive share awards outstanding Weighted Average Contractual Term (in years)	1 year 8 months 12 days
Incentive shares ouststanding Aggregate Intrinsic Value (in millions) | $	$ 9.5
Vested and expected to vest at June 30, 2015	527,000
Vested and expected to vest Weighted Average Contractual Term (in years) | years	0.00
Vested and expected to vest Aggregate Intrinsic Value (in millions) | $	$ 9.0
Weighted-average period of years costs are expected to be recognied over	1 year 8 months 12 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 1.4
Incentive share awards canceled	(14,544)
Incentive shares outstanding at June 30, 2015	282,701
Weighted-average period of years costs are expected to be recognied over	2 years 6 months
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 2.7
Incentive share awards outstanding at January 1, 2015	453,146
Incentive shares granted	69,744
Weighted-average period of years costs are expected to be recognied over	1 year 6 months
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $	$ 0.3
Chief Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 0.3
Incentive shares outstanding at June 30, 2015	300,000

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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 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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