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Debt (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Jun. 30, 2015 EUR (€) | Sep. 30, 2014 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding Credit Facility balance |  | $ 398,937,000 | $ 655,000,000 |  |  |  |  |  |  |
Credit Facility borrowings hedged |  | $ 80,000,000 |  |  |  |  |  |  |  |
Consolidated Leverage Ratio Under Credit Facility & Note Payable, maximum |  | 3.50% |  |  |  |  |  |  |  |
Interest paid |  | $ 34,700,000 | 37,600,000 | $ 31,800,000 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fees |  | 0.25% |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fees |  | 0.075% |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio Under Credit Facility & Note Payable, maximum |  | 3.50% |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 75,000,000 | $ 125,000,000 | $ 150,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.72% |  |
Series A Senior Note [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 75,000,000 |  |  |  |  |  |  |  | $ 50,000,000 | $ 75,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |  |  |  |  |  |  | 3.32% | 3.94%
Debt Instrument, Term | 7 years |  |  |  |  |  |  |  |  |
Series B Senior Note [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 75,000,000 |  |  |  |  |  |  |  | $ 75,000,000 | $ 75,000,000
Debt Instrument, Interest Rate, Stated Percentage | 3.72% |  |  |  |  |  |  |  | 3.76% | 4.04%
Debt Instrument, Term | 12 years |  |  |  |  |  |  |  |  |
Series C Senior Note |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 88,900,000 | € 88,900,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.785% | 1.785% |  |  |  |
Shelf Notes [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 75,000,000 |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 12 years |  |  |  |  |
Agreement Term |  |  |  |  | 3 years |  |  |  |  |
Outdated Unsecured Short Term Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | $ 700,000,000 |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  | $ 850,000,000 |  |  |  |  |  |  |  |
Credit Facility maturity date |  | Dec. 04, 2020 |  |  |  |  |  |  |  |
Outstanding Credit Facility balance |  | $ 398,900,000 | $ 655,000,000 |  |  |  |  |  |  |
Credit Facility weighted average interest rates on outstanding balance |  | 3.63% | 2.81% |  |  |  |  |  |  |
Reduction of Credit Facility Availability |  | $ 1,300,000 | $ 1,000,000 |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |
Minimum Credit Spread On LIBOR Or CDOR Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit spread during period |  | 0.875% |  |  |  |  |  |  |  |
Maximum Credit Spread On LIBOR Or CDOR Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit spread during period |  | 1.375% |  |  |  |  |  |  |  |
Maximum Credit Spread On Prime Rate Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit spread during period |  | 0.375% |  |  |  |  |  |  |  |
Uncommitted Shelf Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 50,000,000 |  |  |  |  |  |  |  |  |
Agreement Term |  |  |  |  | 3 years |  |  |  |  |
Uncommitted Shelf Facility [Member] | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 15 years |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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