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Stock Based Compensation Plan (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Additional Disclosures [Abstract]
Vesting period of awards	4 years
Compensation expense	$ 1.3	$ 1.0
Total compensation cost related to unvested equity awards	$ 6.9
Weighted-average period of recognition of cost	2 years 7 months 6 days
Restricted Stock Award [Member]
Shares or Units and Rights [Roll Forward]
Outstanding, beginning balance (in shares)	397,320
Granted (in shares)	188,290
Restrictions lapsed or exercised (in shares)	(23,847)
Forfeited (in shares)	0
Outstanding, ending balance (in shares)	561,763
Exercisable, ending balance (in shares)	0
Restricted units expected to vest (in shares)	561,763
Weighted-Average Award Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 21.64
Granted (in dollars per share)	21.80
Restrictions lapsed or exercised (in dollars per share)	28.93
Forfeited (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	21.39
Exercisable, ending balance (in dollars per share)	0
Restricted units expected to vest (in dollars per share)	$ 21.39
Additional Disclosures [Abstract]
Vesting period of awards	3 years
Aggregate intrinsic value of outstanding awards	$ 13.7
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)	0
Forfeited (in shares)	0
Outstanding, ending balance (in shares)	100,875
Exercisable, ending balance (in shares)	74,875
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)	0
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 vested awards	$ 0.5
Aggregate intrinsic value of outstanding awards	$ 0.6
Performance Shares [Member]
Shares or Units and Rights [Roll Forward]
Granted (in shares)	59,000
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 weighted-average award price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of non-options outstanding and currently exercisable under the non-stock option 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 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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