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Share and Incentive Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Oct. 01, 2016
Share and Incentive Based Compensation Arrangement
Shares authorized for issuance						4,600,000
Accelerated vesting compensation cost		$ 181	$ 1,825	$ 13,131	$ 1,825
Number of Shares		0	96,000	763,000	96,000
Performance units weighted average grant date fair value	$ 100
Aggregate intrinsic value of performance units vested		$ 3,700		$ 4,800
Performance units compensation expense		1,289	$ 972	4,794	$ 1,562
Restricted Stock
Share and Incentive Based Compensation Arrangement
Aggregate intrinsic value of vested awards		12,500		$ 15,900
Shares granted				5,000
Restricted Stock | Minimum
Share and Incentive Based Compensation Arrangement
Vesting period				1 year
Restricted Stock | Maximum
Share and Incentive Based Compensation Arrangement
Vesting period				3 years
Performance Share Units
Share and Incentive Based Compensation Arrangement
Aggregate intrinsic value of vested awards		$ 2,200		$ 2,700
Shares granted				0

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Employee Incentive Plan, Performance Units, Compensation Expense

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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