Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivatives and Hedging Activities (Narrative) (Details)

v3.7.0.1
Derivatives and Hedging Activities (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Gain (loss) on derivative instrument $ 2,100 $ 4,900
Notional amount 69,137 106,004
Foreign Exchange Contract [Member] | Cash Flow Hedge [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 15,900 $ 16,400