Earnings Per Share Antidilutive Securities excluded from the Computaion of Earnings Per Share (Details) - shares	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Employee Stock Option [Member]
Stock Option [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	143	0
Performance Shares [Member]
Stock Option [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	127

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration