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Derivative Instruments and Hedging Activities (Narrative) (Details)	1 Months Ended	3 Months Ended
	Aug. 31, 2013 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	May 31, 2018 USD ($) loan	Sep. 23, 2016 EUR (€)	Oct. 01, 2013 USD ($)	Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative		$ 18,563,000
Translation Adjustment for Net Investment Hedge Increase (Decrease), Gross		649,000	$ (743,000)
Unrealized gain (loss) on fair value adjustment of derivative instruments (Note 8)		$ 18,563,000
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI		12 months
Face Amount | €				€ 160,000,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | EUR Denominated Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Translation Adjustment for Net Investment Hedge Increase (Decrease), Gross		$ 649,000	$ (743,000)
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI					$ (10,578,000)	$ 21,315,000
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, number of instruments | loan							5
Derivative, notional amount							$ 400,000,000
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount							400,000,000
Floating-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount							$ 167,420,000
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative	$ 507,000
Unrealized gain (loss) on fair value adjustment of derivative instruments (Note 8)	$ 507,000
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings		$ 72,000
Derivative, notional amount										$ 25,000,000
2013 Note Purchase Agreement [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount									$ 250,000,000
2016 Note Purchase Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date		Sep. 23, 2016
Series O Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €								€ 43,000,000
Series N Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €								77,000,000
Series M Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €				€ 40,000,000				€ 40,000,000

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
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