Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments - Narrative (Details)

v3.7.0.1
Derivative Financial Instruments - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Gains expected to be reclassified to earnings within the next twelve months $ 800,000    
Pre-tax gain recognized in earnings on derivatives not designated as hedging instruments 800,000    
Gain (loss) on derivatives not designated as hedging instruments   $ 0 $ 0
Fair value hedging | Foreign currency forward      
Derivative [Line Items]      
Notional amount $ 22,200,000    
Cash flow hedging | Foreign currency forward      
Derivative [Line Items]      
Length of derivative hedge (up to) 15 months    
Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative asset $ 800,000 0  
Derivative liability $ 0 $ 0