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Subsequent Events (Details) $ / shares in Units, $ in Thousands, £ in Millions		1 Months Ended			3 Months Ended		6 Months Ended
	Aug. 02, 2018 $ / shares	Jul. 31, 2018 GBP (£)	Jul. 31, 2018 USD ($)	Dec. 30, 2017 USD ($)	Jun. 30, 2018 GBP (£) $ / shares	Jul. 01, 2017 $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jul. 01, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($)
Subsequent Events
Common stock quarterly cash dividend declared (in dollars per share) | $ / shares					$ 0.17	$ 0.14	$ 0.17	$ 0.14
Share repurchases, Average price per share (in dollars per share) | $ / shares					$ 55.99	$ 34.63	$ 53.90	$ 34.63
Repayment of borrowings							$ 8,802	$ 11,500
Borrowings on revolving line of credit									$ 20,789
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU
Subsequent Events
GNU final distribution gain received on sale of business assets				$ 600
Revolving credit facility
Subsequent Events
Borrowings on revolving line of credit				$ 0					20,800
Term of line of credit							12 months
Revolving credit facility | United States
Subsequent Events
Borrowings on revolving line of credit									$ 17,500
Revolving credit facility | United Kingdom
Subsequent Events
Borrowings on revolving line of credit | £					$ 2.5
Subsequent Events
Subsequent Events
Common stock quarterly cash dividend declared (in dollars per share) | $ / shares	$ 0.17
Subsequent Events | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU
Subsequent Events
GNU final distribution gain received on sale of business assets			$ 56
Subsequent Events | Revolving credit facility | United States
Subsequent Events
Repayment of borrowings			7,500
Borrowings on revolving line of credit			$ 10,000
Subsequent Events | Revolving credit facility | United Kingdom
Subsequent Events
Repayment of borrowings | £		£ 2.5

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- Definition

Amount before tax of gain received on disposal of asset in accordance with the asset purchase agreement.

+ References

No definition available.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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