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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015 to December 31, 2017 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 |
Forfeited | (183 | ) |  | 9.08 |
Vested | (255,828 | ) |  | 10.39 |
Unvested balance at December 31, 2015 | 474,567 |  |  | 12.72 |
Granted | 461,281 |  |  | 8.94 |
Forfeited | (126,610 | ) |  | 10.08 |
Vested | (241,698 | ) |  | 11.83 |
Unvested balance at December 31, 2016 | 567,540 |  |  | 10.62 |
Granted | 324,502 |  |  | 11.19 |
Forfeited | (16,669 | ) |  | 10.80 |
Vested | (244,411 | ) |  | 11.29 |
Unvested balance at December 31, 2017 | 630,962 |  |  | $ | 10.66 |
Performance Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Fair Value Valuation Assumptions | The determination of the grant-date fair values of outstanding awards 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 |
February 26, 2016 |  | 24.3 | % |  | 0.93 | % |  | $ | 8.42 |
February 26, 2017 |  | 26.7 | % |  | 1.46 | % |  | $ | 10.89 |
Schedule of Nonvested Performance-based Units Activity | A summary of our PSUs from January 1, 2015 to December 31, 2017 is as follows:
| Number of 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 | 21,722 |  |  | 13.51 |
Unvested balance at December 31, 2015 | 676,359 |  |  | 11.41 |
Granted | 310,398 |  |  | 8.54 |
Additional units from dividends | 38,324 |  |  | 9.37 |
Vested (1) | (242,096 | ) |  | 9.85 |
Forfeited | (96,301 | ) |  | 10.74 |
Unvested balance at December 31, 2016 | 686,684 |  |  | 10.65 |
Granted | 266,009 |  |  | 11.04 |
Additional units from dividends | 33,478 |  |  | 11.17 |
Vested (2) | (200,374 | ) |  | 12.15 |
Unvested balance at December 31, 2017 | 785,797 |  |  | $ | 10.42 |
______________________
(1) | The number of shares of common stock earned for the PSUs vested in 2016 was equal to 89.5% of the PSU Target Award.
(2) | There was no payout of shares of our common stock for PSUs that vested on February 27, 2017, as our total stockholder return fell below the 30 th percentile of the total stockholder returns of the peer group over the three-year performance period.

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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=96867065&loc=d3e5070-113901 + Details
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