Derivative Financial Instruments - Additional Information (Details)
$ in Thousands |
12 Months Ended |
|
|
|
|
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
Sep. 30, 2015
CAD
$ / option
$ / CAD
|
Jun. 30, 2015
CAD
collar_arrangement
|
May. 30, 2014
CAD
|
May. 14, 2014
CAD
$ / CAD
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Exchange rate floor | $ / CAD |
|
|
|
|
|
|
0.91
|
| Exchange rate cap | $ / CAD |
|
|
|
|
|
|
0.93
|
| Gain associated with derivative instruments | $ |
$ 5,161
|
$ 1,536
|
$ 0
|
|
|
|
|
| Foreign Exchange Option/Maturing in 2016 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Derivative, Number of Instruments Held | collar_arrangement |
|
|
|
|
4
|
|
|
| Notional |
|
|
|
|
CAD 32,000,000
|
|
|
| Exchange rate floor | $ / CAD |
|
|
|
0.84
|
|
|
|
| Exchange rate cap | $ / CAD |
|
|
|
0.86
|
|
|
|
| Foreign Exchange Contract |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
|
|
|
CAD 37,200,000
|
| Foregn Exchange Option/Maturing in 2015 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
|
|
CAD 37,200,000
|
|
| Puts (purchased) [Member] | Foreign Exchange Option/Maturing in 2016 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 32,011,290
|
|
|
|
| Strike Price | $ / option |
|
|
|
0.84
|
|
|
|
| Market Price | $ / option |
|
|
|
0.7210
|
|
|
|
| Puts (purchased) [Member] | Foregn Exchange Option/Maturing in 2015 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 0
|
|
|
|
| Strike Price | $ / option |
|
|
|
0
|
|
|
|
| Market Price | $ / option |
|
|
|
0
|
|
|
|
| Calls (written) [Member] | Foreign Exchange Option/Maturing in 2016 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 32,011,290
|
|
|
|
| Strike Price | $ / option |
|
|
|
0.86
|
|
|
|
| Market Price | $ / option |
|
|
|
0.721
|
|
|
|
| Calls (written) [Member] | Foregn Exchange Option/Maturing in 2015 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 0
|
|
|
|
| Strike Price | $ / option |
|
|
|
0
|
|
|
|
| Market Price | $ / option |
|
|
|
0
|
|
|
|
| Minimum | Foreign Exchange Option/Maturing in 2016 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 7,900,000
|
|
|
|
| Maximum | Foreign Exchange Option/Maturing in 2016 [Member] |
|
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
|
|
| Notional |
|
|
|
CAD 8,100,000
|
|
|
|