Hedging Instruments (Narrative) (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 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	$ 2,300
Discussion of Foreign Currency Derivative Risk Management Policy	We hedge approximately 85% 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	$ 186,700
Unrealized gain on net investment hedge	$ 1,894
Series C Senior Note [Member]
Derivative [Line Items]
Notes Payable		€ 88.9	$ 100,000
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