|
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 |