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Subsequent Events (Details) $ / shares in Units, $ in Thousands, £ in Millions		12 Months Ended
	Feb. 15, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 24, 2019 $ / shares	Jan. 15, 2019 GBP (£)	Dec. 31, 2018 GBP (£)
Subsequent Event [Line Items]
Dividends paid | $		$ 106,943	$ 101,511	$ 205,468
Foreign Currency Forward
Subsequent Event [Line Items]
Face amount | £							£ 46.0
Subsequent Event
Subsequent Event [Line Items]
Dividends declared per share to shareholders (usd per share) | $ / shares					$ 0.27
Dividends paid | $	$ 27,200
Subsequent Event | Foreign Currency Forward
Subsequent Event [Line Items]
Face amount | £						£ 15.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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X

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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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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- Details

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