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Derivatives - Foreign Currency Derivative Contracts (Details) - Foreign Currency Forward - Not Designated as Hedging Instrument
$ in Thousands
Dec. 31, 2015
USD ($)
$ / £
$ / €
$ / NOK
$ / CAD
Canadian dollar  
Derivative [Line Items]  
Notional amount $ 5,091
Contractual exchange rate | $ / CAD 1.3751
Euro  
Derivative [Line Items]  
Notional amount $ 19,706
Contractual exchange rate | $ / € 1.0948
Norwegian kroner  
Derivative [Line Items]  
Notional amount $ 11,498
Contractual exchange rate | $ / NOK 8.6973
Pound sterling  
Derivative [Line Items]  
Notional amount $ 7,516
Contractual exchange rate | $ / £ 1.5031