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Stock Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Restricted Stock Awards | A summary of our restricted stock awards from January 1, 2015 to March 31, 2015 is as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2015 | 514,419 |  |  | $ | 10.82 |
Granted | 216,159 |  |  | 14.48 |
Vested | (255,828 | ) |  | 10.39 |
Unvested balance at March 31, 2015 | 474,750 |  |  | $ | 12.72 |
Schedule of Share-based Payment Award, Stock Options, 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 value of the awards granted during the three months ended March 31, 2015 included the following assumptions:
Award Grant Date |  | Volatility |  | Risk-Free Rate |  | Fair Value at Grant Date
February 27, 2015 |  | 22.9 | % |  | 1.01 | % |  | $ | 12.13 |
Schedule of Nonvested Performance-based Units Activity | A summary of our PSUs from January 1, 2015 to March 31, 2015 is as follows:
| Number of Target Units |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2015 | 436,170 |  |  | $ | 10.95 |
Granted | 218,467 |  |  | 12.13 |
Additional units from dividends | 2,955 |  |  | 15.13 |
Unvested balance at March 31, 2015 | 657,592 |  |  | $ | 11.36 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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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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