Employee Termination Benefits (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Termination Benefits
Cash	$ 3,486	$ 862	$ 3,486	$ 19,499
Share-Based Compensation	$ 979	$ 181	$ 979	$ 13,131
Number of Shares	81	0	81	763
Total Employee Termination Benefits	$ 4,465	$ 1,043	$ 4,465	$ 32,630
Executive Employee Termination Benefits
Employee Termination Benefits
Cash	877	0	877	11,945
Share-Based Compensation	$ 478	$ 82	$ 478	$ 9,196
Number of Shares	37	0	37	554
Total Employee Termination Benefits	$ 1,355	$ 82	$ 1,355	$ 21,141
Other Employee Termination Benefits
Employee Termination Benefits
Cash	2,609	862	2,609	7,554
Share-Based Compensation	$ 501	$ 99	$ 501	$ 3,935
Number of Shares	44	0	44	209
Total Employee Termination Benefits	$ 3,110	$ 961	$ 3,110	$ 11,489

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=115931487&loc=d3e140904-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration