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Stock Incentive Plans | 12 Months Ended
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Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Incentive Plans | Stock Incentive Plans We are authorized to issue up to 8,000,000 shares of our common stock under our 2004 Stock Option and Incentive Plan, as amended (the “Incentive Plan”), of which we have issued or committed to issue 3,110,661 shares as of December 31, 2011. In addition to these shares, additional shares of common stock could be issued in connection with the market stock unit awards as further described below and the stock appreciation rights issued in 2008. On May 6, 2011, we issued (i) 11,872 shares of common stock and (ii) 17,808 deferred stock units to our board of directors having an aggregate value of $325,000, based on the closing price for our common stock on such day. Restricted Stock Awards Restricted stock awards issued to our officers and employees generally vest over a 3-year period from the date of the grant based on continued employment. We measure compensation expense for the restricted stock awards based upon the fair market value of our common stock at the date of grant. Compensation expense is recognized on a straight-line basis over the vesting period and is included in corporate expenses in the accompanying consolidated statements of operations. A summary of our restricted stock awards from January 1, 2009 to December 31, 2011 is as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2009 | 605,809 |  |  | $ | 13.02 |
Granted | 1,517,435 |  |  | 2.82 |
Forfeited | (7,184 | ) |  | 14.61 |
Vested | (396,684 | ) |  | 9.77 |
Unvested balance at December 31, 2009 | 1,719,376 |  |  | 4.76 |
Granted | 356,964 |  |  | 8.41 |
Additional shares from dividends | 46,206 |  |  | 9.57 |
Vested | (573,848 | ) |  | 5.19 |
Unvested balance at December 31, 2010 | 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 |
The remaining share awards are expected to vest as follows: 691,862 shares during 2012, 218,967 during 2013, and 99,298 during 2014. As of December 31, 2011, the unrecognized compensation cost related to restricted stock awards was $3.8 million and the weighted-average period over which the unrecognized compensation expense will be recorded is approximately 21 months. For the years ended December 31, 2011, 2010, and 2009 we recorded $3.6 million, $3.2 million, and $5.7 million, respectively, of compensation expense related to restricted stock awards. Market Stock Units We have awarded our executive officers market stock units (“MSUs”). MSUs are restricted stock units that vest 3 years from the date of grant. Each executive officer is granted a target number of MSUs (the “Target Award”). The actual number of shares of common stock issued to each executive officer at the vesting date is equal to the Target Award plus an additional number of shares of common stock to reflect dividends that would have been paid during the Performance Period on the Target Award multiplied by the percentage of total stockholder return over the Performance Period. The total stockholder return is based on the 30-trading day average closing price of our common stock calculated on the vesting date plus dividends paid and the 30-trading day average closing price of our common stock on the date of grant. There will be no payout of shares of our common stock if the total stockholder return percentage on the vesting date is less than 50% of the target return. The maximum payout to an executive officer under an MSU award is equal to 150% of the Target Award. The fair values of the MSU awards are determined using a Monte Carlo simulation. A summary of our MSU awards from January 1, 2010 to December 31, 2011 is as follows:
| Number of Units |  | Weighted- Average Grant Date Fair Value
Unvested balance at January 1, 2010 | — |  |  | $ | — |
Granted | 84,854 |  |  | 9.87 |
Unvested balance at December 31, 2010 | 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 |
As of December 31, 2011, the unrecognized compensation cost related to the MSUs was $1.0 million and is expected to be recognized on a straight-line basis over a weighted average period of 26 months. For the years ended December 31, 2011 and 2010, we recorded $0.6 million and $0.2 million, respectively, of compensation expense related to market stock units.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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