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Equity - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		12 Months Ended
	Feb. 28, 2018	Jan. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Feb. 29, 2016
Stockholders Equity Note [Line Items]
Share repurchases			$ 15,544,000
Share Repurchase Plan, February 2016
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board						$ 100,000,000
Shares repurchased pursuant to authorization (in shares)		1,040,829			610,342
Share repurchases		$ 16,000,000			$ 9,000,000
Available authorization remaining for repurchase					$ 77,000,000
Share Repurchase Plan, February 2018
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board	$ 100,000,000
Available authorization remaining for repurchase			$ 100,000,000
Increase in authorized repurchase amount	$ 39,000,000
Equity awards
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)			6,838	5,826

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Stock Repurchase Program, Increase In Authorized Repurchase Amount

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Stockholders Equity Note [Line Items]

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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
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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-Topic 505
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