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Earnings per Share - Anti-dilutive Shares (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Performance based restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	1,751,022	1,773,693
Performance based stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	586,253	650,985
Restricted stock awards and restricted units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	0	477,720
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	621,747	1,539,536

X

- Definition

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.

+ References

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

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- Definition

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+ References

No definition available.

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