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Hedging Instruments (Narrative) (Details) $ in Thousands, € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |
Estimated net amount of gains expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months | $ 4,900 |  |  |
Discussion of Foreign Currency Derivative Risk Management Policy | We hedge approximately 85 percent of the estimated exposure |  |  |
Cash Flow Hedge, hedge percentage of Eetimated exposure from intercompany products purchases and sales | 85.00% |  |  |
General duration of foreign currency exchange contracts | 24 months |  |  |
Credit Facility borrowings hedged |  |  |  | $ 80,000
Notional Amount of Foreign Currency Exchange Contracts |  | $ 176,100 |  | $ 175,900
Unrealized gain on net investment hedge | $ 2,142 | $ 1,894 |  |
Series C Senior Note [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt Instrument, Face Amount | € |  |  | € 88.9 |
Stated interest rate |  |  | 1.785% | 1.785%
Interest Rate Swap Effective On March 30, 2012 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed portion of interest rate associated with interest rate swap |  |  | 1.36% | 1.36%
Credit Facility borrowings hedged |  |  |  | $ 40,000
Interest Rate Swap Effective On March 28, 2013 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed portion of interest rate associated with interest rate swap |  |  | 1.64% | 1.64%
Credit Facility borrowings hedged |  |  |  | $ 40,000

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