Derivative Instruments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Intercompany debt designated as a non-derivative net investment hedging instrument	$ 13,300,000		$ 13,300,000	$ 11,800,000
Gain (loss) currency translation adjustment	$ 900,000.0	$ 1,800,000
Foreign Currency Derivatives
Derivative [Line Items]
Notional amounts of foreign currency derivatives				$ 23,100,000
Maximum | Foreign Currency Derivatives
Derivative [Line Items]
Derivative maturities			December, 2016