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.

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

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

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

+ References

No definition available.

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- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Shareholders' Equity and Share Based Payment Shareholders' Equity and Share Based Payment (Details Textual) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense	$ 6,028	$ 2,094	$ 8,130	$ 3,737
Total Performance-Based Shares Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted			224,147
AROEPerformanceBasedShares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted			315,588
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense			$ 2,914
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost			1,581
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	5,450		$ 5,450
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition			2 years 230 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense			$ 5,216
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost			1,611
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 7,511		$ 7,511