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Stock Based Compensation Plan (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Additional Disclosures [Abstract]
Vesting period of awards	4 years
Stock based compensation expense	$ 2.2	$ 2.2
Total compensation cost related to unvested equity awards	$ 6.1
Weighted-average period of recognition of cost	2 years 6 months
Restricted Stock Award [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	397,320
Granted (in shares)	199,382
Restrictions lapsed or exercised (in shares)	(157,406)
Forfeited (in shares)	(1,361)
Outstanding, ending balance (in shares)	437,935
Exercisable, ending balance (in shares)	0
Restricted units expected to vest (in shares)	416,503
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 21.64
Granted (in dollars per share)	22.00
Restrictions lapsed or exercised (in dollars per share)	22.02
Forfeited (in dollars per share)	20.71
Outstanding, ending balance (in dollars per share)	21.67
Exercisable, ending balance (in dollars per share)	0
Restricted units expected to vest (in dollars per share)	$ 21.69
Additional Disclosures [Abstract]
Vesting period of awards	3 years
Aggregate intrinsic value of outstanding awards	$ 11.0
Stock-Settled Appreciation Rights [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	100,875
Granted (in shares)	0
Restrictions lapsed or exercised (in shares)	(35,875)
Forfeited (in shares)	0
Outstanding, ending balance (in shares)	65,000
Exercisable, ending balance (in shares)	65,000
Restricted units expected to vest (in shares)	0
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 18.14
Granted (in dollars per share)	0
Restrictions lapsed or exercised (in dollars per share)	18.14
Forfeited (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	18.14
Exercisable, ending balance (in dollars per share)	18.14
Restricted units expected to vest (in dollars per share)	$ 0
Additional Disclosures [Abstract]
Aggregate intrinsic value of outstanding awards	$ 0.5
Aggregate intrinsic value of vested awards	$ 0.5
Performance Shares [Member]
Shares or Units and Rights [Roll Forward]
Granted (in shares)	63,000
Performance Shares [Member] | Maximum [Member]
Additional Disclosures [Abstract]
Vesting period of awards	4 years
Performance Shares [Member] | Minimum [Member]
Additional Disclosures [Abstract]
Vesting period of awards	1 year

X

- Definition

The weighted average award price for shares exercised or restrictions lapsed for nonvested equity-based awards exercised 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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Number of other-than option equity instruments exercised by participants.

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The number of shares into which fully or partially vested non-stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that vested and expected to vest as of the balance sheet date.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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