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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument
$ in Thousands
Mar. 31, 2016
USD ($)
$ / £
$ / €
$ / NOK
$ / CAD
Dec. 31, 2015
USD ($)
$ / £
$ / €
$ / NOK
$ / CAD
Canadian dollar | Foreign currency contracts    
Derivative [Line Items]    
Notional Amount $ 2,989 $ 5,091
Contractual Exchange Rate | $ / CAD 1.3384 1.3751
Euro | Foreign currency contracts    
Derivative [Line Items]    
Notional Amount   $ 19,706
Contractual Exchange Rate | $ / €   1.0948
Euro | Foreign currency contracts, Settlement Date April 11, 2016    
Derivative [Line Items]    
Notional Amount $ 4,418  
Contractual Exchange Rate | $ / € 1.1045  
Euro | Foreign currency contracts, Settlement Date April 15, 2016    
Derivative [Line Items]    
Notional Amount $ 3,603  
Contractual Exchange Rate | $ / € 1.10848  
Norwegian kroner | Foreign currency contracts    
Derivative [Line Items]    
Notional Amount $ 9,341 $ 11,498
Contractual Exchange Rate | $ / NOK 8.5646 8.6973
Pound sterling | Foreign currency contracts    
Derivative [Line Items]    
Notional Amount $ 5,668 $ 7,516
Contractual Exchange Rate | $ / £ 1.417 1.5031