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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2012 to December 31, 2014 is as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2012 | 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 |
Granted | 249,311 |  |  | 12.39 |
Forfeited | (537 | ) |  | 9.32 |
Vested | (317,376 | ) |  | 10.19 |
Unvested balance at December 31, 2014 | 514,419 |  |  | $ | 10.82 |
Performance Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Fair Value Valuation Assumptions | The fair values of the PSU awards are determined using a Monte Carlo simulation performed by a third-party valuation firm. Each simulation also considered the share performance of the Company and the peer group. The determination of the grant-date fair values of the awards included the following assumptions:
Award Grant Date |  | Volatility |  | Risk-Free Rate |  | Fair Value at Grant Date
March 3, 2013 |  | 39.2 | % |  | 0.36 | % |  | $ | 9.55 |
May 15, 2013 |  | 37.9 | % |  | 0.40 | % |  | $ | 10.41 |
March 3, 2014 |  | 33.5 | % |  | 0.66 | % |  | $ | 12.77 |
May 15, 2014 |  | 33.1 | % |  | 0.80 | % |  | $ | 9.88 |
Schedule of Nonvested Performance-based Units Activity | A summary of our PSUs from January 1, 2013 to December 31, 2014 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 |
Unvested balance at December 31, 2013 | 223,176 |  |  | 9.66 |
Granted | 200,685 |  |  | 12.33 |
Additional units from dividends | 12,309 |  |  | 12.01 |
Unvested balance at December 31, 2014 | 436,170 |  |  | $ | 10.95 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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