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Subsequent Events (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares	Mar. 31, 2017 $ / shares	Apr. 25, 2018 USD ($)	Oct. 25, 2017 USD ($)	Feb. 25, 2016 USD ($)
Subsequent Event [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 300,000,000
Dividends declared per common share (in dollars per Share) | $ / shares	$ 0.075	$ 0.05
Stock repurchase program, authorized amount	$ 26,000,000			$ 40,000,000.0	$ 25,000,000.0
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 150,000,000
Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Revolving credit facility, maximum borrowing capacity			$ 200,000,000
Debt Compliance Period, Period One [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital			4.50
Debt Compliance Period, Period Two [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital			4.25
Debt Compliance Period, Period Two [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital			4.00
Debt Compliance Period, Period Four [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital			3.75
Debt Compliance Period, Period Five [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital			3.50

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

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- Definition

Amount of stock repurchase plan authorized.

+ References

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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