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Stock-Based Compensation - Restricted Stock December 2014 Table (Details) - $ / shares		3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 09, 2014	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's granted (in dollars per share)		$ 0.70	$ 1.11	$ 1.15
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)					0
RSU's granted (in dollars per share)					$ 0.00
Vested (in shares)					0
Chief Executive Officer | December 2014 Award | Restricted stock units | Service-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	30,902
RSU's granted (in dollars per share)	$ 32.36
Vested (in shares)	15,450
Chief Executive Officer | December 2014 Award | Restricted stock units | Performance-based - Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	11,588
RSU's granted (in dollars per share)	$ 43.47
Vested (in shares)	4,635
Chief Executive Officer | December 2014 Award | Restricted stock units | Performance-based - Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	11,588
RSU's granted (in dollars per share)	$ 0.00

X

- 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

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).

+ 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

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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