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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share Based Compensation Restricted Stock Activity | A summary of our restricted stock awards from January 1, 2011 to December 31, 2013 is as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2011 | 1,548,698 |  |  | $ | 5.49 |
Granted | 308,486 |  |  | 11.54 |
Additional shares from dividends | 18,302 |  |  | 9.23 |
Forfeited | (17,560 | ) |  | 7.02 |
Vested | (847,799 | ) |  | 6.01 |
Unvested balance at December 31, 2011 | 1,010,127 |  |  | 6.97 |
Granted | 365,599 |  |  | 9.84 |
Additional shares from dividends | 8,507 |  |  | 10.07 |
Forfeited | (11,563 | ) |  | 10.05 |
Vested | (696,559 | ) |  | 5.39 |
Unvested balance at December 31, 2012 | 676,111 |  |  | 10.10 |
Granted | 323,526 |  |  | 9.33 |
Additional shares from dividends | 1,040 |  |  | 9.30 |
Forfeited | (16,934 | ) |  | 9.65 |
Vested | (400,722 | ) |  | 9.94 |
Unvested balance at December 31, 2013 | 583,021 |  |  | $ | 9.80 |
Market Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of our MSUs from January 1, 2011 to December 31, 2013 is shown in the following table. We have not issued MSU awards since 2012.
| Number of Units |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2011 | 84,854 |  |  | $ | 9.87 |
Granted | 72,599 |  |  | 13.43 |
Additional units from dividends | 4,122 |  |  | 9.23 |
Unvested balance at December 31, 2011 | 161,575 |  |  | 11.45 |
Granted | 89,990 |  |  | 11.14 |
Additional units from dividends | 7,277 |  |  | 10.18 |
Unvested balance at December 31, 2012 | 258,842 |  |  | 11.31 |
Additional units from dividends | 6,452 |  |  | 10.00 |
Vested | (90,620 | ) |  | 9.86 |
Unvested balance at December 31, 2013 | 174,674 |  |  | $ | 12.01 |
Schedule of Share-based Payment Award, Stock Units, Valuation Assumptions | The determination of the grant-date fair values of the awards included the following assumptions:
|  | Volatility |  | Risk-Free Rate |  | Fair Value at Grant Date
March 2011 Award |  | 64.0 | % |  | 1.20 | % |  | $ | 13.43 |
March 2012 Award |  | 62.0 | % |  | 0.43 | % |  | $ | 11.14 |
Performance Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The simulations also considered the share performance of the Company and the peer group. A summary of our PSUs from January 1, 2013 to December 31, 2013 is as follows:
| Number of Units |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2013 | — |  |  | $ | — |
Granted | 217,949 |  |  | 9.64 |
Additional units from dividends | 5,227 |  |  | 10.37 |
Vested | — |  |  | — |
Unvested balance at December 31, 2013 | 223,176 |  |  | $ | 9.66 |
Schedule of Share-based Payment Award, Stock Units, Valuation Assumptions | The fair values of the PSU awards are determined using a Monte Carlo simulation performed by a third-party valuation firm. The determination of the grant-date fair values of the awards included the following assumptions:
|  | Volatility |  | Risk-Free Rate |  | Fair Value at Grant Date
March 2013 Award |  | 39.2 | % |  | 0.36 | % |  | $ | 9.55 |
May 2013 Award |  | 37.9 | % |  | 0.40 | % |  | $ | 10.41 |

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