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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument
$ in Thousands
Jun. 30, 2016
USD ($)
$ / £
$ / €
$ / NOK
$ / CAD
Dec. 31, 2015
USD ($)
$ / £
$ / €
$ / NOK
$ / CAD
Foreign currency contracts | Canadian dollar    
Derivative [Line Items]    
Notional Amount $ 3,765 $ 5,091
Contractual Exchange Rate | $ / CAD 1.2749 1.3751
Foreign currency contracts | Euro    
Derivative [Line Items]    
Notional Amount   $ 19,706
Contractual Exchange Rate | $ / €   1.0948
Foreign currency contracts | Norwegian kroner    
Derivative [Line Items]    
Notional Amount $ 5,891 $ 11,498
Contractual Exchange Rate | $ / NOK 8.1482 8.6973
Foreign currency contracts | Pound sterling    
Derivative [Line Items]    
Notional Amount $ 3,620 $ 7,516
Contractual Exchange Rate | $ / £ 1.4480 1.5031
Foreign currency contracts, settlement date September 13, 2016 | Euro    
Derivative [Line Items]    
Notional Amount $ 4,420  
Contractual Exchange Rate | $ / € 1.1334  
Foreign currency contracts, settlement date July 14, 2016 | Euro    
Derivative [Line Items]    
Notional Amount $ 3,470  
Contractual Exchange Rate | $ / € 1.1192