Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Chief Executive Officer Retirement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Related Party Transaction [Line Items]
Retirement severance expense	$ 0	$ 0	$ 18,578	$ 0
Cash Payment [Member] \| Employee Severance [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Retirement severance expense			11,800
Taxes and Other Expenses [Member] \| Employee Severance [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Retirement severance expense			400
Share Options [Member] \| Accelerated Vesting of Shares [Member] \| Employee Severance [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Retirement severance expense			$ 1,400
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number			101,640
Nonvested Shares [Member] \| Accelerated Vesting of Shares [Member] \| Employee Severance [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Retirement severance expense			$ 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number			113,900