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Share Capital (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Performance Shares [Member]
      
Employee Stock Incentive Plan [Line Items]      
Number Outstanding, Beginning balance 534,779 2,070,835 752,885
Number Outstanding, Granted 300,756 1,130,844 1,646,631
Number Outstanding, Vested (353,858) (2,621,981) (326,546)
Number Outstanding, Forfeited (19,011) (44,919) (2,135)
Number Outstanding, Ending balance 462,666 534,779 2,070,835
Weighted Average Grant Date Fair Value, Beginning balance $ 10.73 $ 10.54 $ 5.89
Weighted Average Grant Date Fair Value, Granted $ 8.97 $ 8.70 $ 12.26
Weighted Average Grant Date Fair Value, Vested $ 10.63 $ 9.63 $ 8.49
Weighted Average Grant Date Fair Value, Forfeited $ 7.90 $ 10.44 $ 9.73
Weighted Average Grant Date Fair Value, Ending balance $ 9.79 $ 10.73 $ 10.54
Time Based Awards [Member]
      
Employee Stock Incentive Plan [Line Items]      
Number Outstanding, Beginning balance 835,438 877,349 924,101
Number Outstanding, Granted 2,612,520 375,356 446,280
Number Outstanding, Vested (2,499,083) (395,187) (430,851)
Number Outstanding, Forfeited (35,087) (22,080) (62,181)
Number Outstanding, Ending balance 913,788 835,438 877,349
Weighted Average Grant Date Fair Value, Beginning balance $ 8.48 $ 8.57 $ 4.93
Weighted Average Grant Date Fair Value, Granted $ 16.83 $ 7.78 $ 11.29
Weighted Average Grant Date Fair Value, Vested $ 15.79 $ 8.17 $ 3.45
Weighted Average Grant Date Fair Value, Forfeited $ 10.91 $ 9.88 $ 5.86
Weighted Average Grant Date Fair Value, Ending balance $ 12.54 $ 8.48 $ 8.57