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Employee Benefit Plans Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock by Class [Table Text Block] | The following table sets forth our Preferred Stock:
Preferred Stock Issuances |  | Issue Date |  | Number of Shares Outstanding |  | Carrying Value |  | Liquidation Preference Per Share |  | Optional Redemption Date |  | Annual Dividends Payable Per Share
|  |  |  | (in thousands) |  |  |  |  |  |  |  |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 29,077 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 29,092 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
8.000% Series B Cumulative Redeemable |  | 9/25/1997 |  | 2,100 |  |  | $ | 52,500 |  |  | $ | 25 |  |  | 9/25/2002 |  | $ | 2.00 |
Our officers generally receive annual grants of stock options and restricted stock on or about March 1 of each year. Restricted stock grants are also made annually to directors and certain other employees. Dividends received on restricted stock are non-forfeitable and are paid at the same rate and on the same date as on shares of Common Stock. Dividends paid on subsequently forfeited shares are expensed. Additional total return-based restricted stock may be issued at the end of the three-year periods if actual performance exceeds certain levels of performance. Such additional shares, if any, would be fully vested when issued. No expense is recorded for additional shares of total return-based restricted stock that may be issued at the end of the three-year period since that possibility is already reflected in the grant date fair value. The following table sets forth the number of shares of Common Stock reserved for future issuance:
| December 31,
| 2011 |  | 2010
Outstanding stock options and warrants | 1,224,455 |  |  | 1,495,196 |
Possible future issuance under equity incentive plans | 2,363,695 |  |  | 2,642,620 |
| 3,588,150 |  |  | 4,137,816 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following table sets forth stock option activity:
| Options Outstanding
| Number of Shares |  | Weighted Average Exercise Price
Balance at December 31, 2008 | 1,489,250 |  |  | $ | 28.74 |
Options granted | 394,044 |  |  | 19.00 |
Options cancelled | (111,590 | ) |  | 27.65 |
Options exercised | (303,931 | ) |  | 24.18 |
Balances at December 31, 2009 | 1,467,773 |  |  | 27.15 |
Options granted | 190,826 |  |  | 29.05 |
Options exercised | (178,403 | ) |  | 22.54 |
Balances at December 31, 2010 (1) (2) | 1,480,196 |  |  | 27.95 |
Options granted | 146,581 |  |  | 33.93 |
Options exercised | (417,322 | ) |  | 26.79 |
Balances at December 31, 2011 | 1,209,455 |  |  | $ | 29.08 |
__________
13. | Employee Benefit Plans - Continued
(1) | The outstanding options at December 31, 2011 had a weighted average remaining life of 3.5 years.
(2) | We have 646,029 options exercisable at December 31, 2011 with weighted average exercise price of $31.01, weighted average remaining life of 2.4 years and intrinsic value of $1.1 million. Of these exercisable options, 252,277 had exercise prices higher than the market price of our Common Stock at December 31, 2011.
Schedule of NonQualified Deferred Compensation Liability [Table Text Block] | The following table sets forth our deferred compensation liability:
| Years Ended December 31,
| 2011 |  | 2010 |  | 2009
Beginning deferred compensation liability | $ | 4,091 |  |  | $ | 6,898 |  |  | $ | 6,522 |
Contributions to deferred compensation plans | 545 |  |  | 229 |  |  | — |
Mark-to-market adjustment to deferred compensation (general and administrative expense) | (119 | ) |  | 246 |  |  | 1,497 |
Distributions from deferred compensation plans | (1,368 | ) |  | (3,282 | ) |  | (1,121 | )
Total deferred compensation liability | $ | 3,149 |  |  | $ | 4,091 |  |  | $ | 6,898 |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Stock options issued prior to 2005 vest ratably over four years and remain outstanding for 10 years. Stock options issued beginning in 2005 vest ratably over a four-year period and remain outstanding for seven years. The value of all options as of the date of grant is calculated using the Black-Scholes option-pricing model and is amortized over the respective vesting or service period. The fair values of options granted during 2011, 2010 and 2009 were $6.47, $4.96 and $1.82, respectively, per option. The fair values of the options granted were determined at the grant dates using the following assumptions:
| 2011 |  | 2010 |  | 2009
Risk free interest rate (1) | 2.4 | % |  | 2.6 | % |  | 2.3 | %
Common stock dividend yield (2) | 5.0 | % |  | 5.9 | % |  | 9.0 | %
Expected volatility (3) | 32.5 | % |  | 32.2 | % |  | 29.9 | %
Average expected option life (years) (4) | 5.75 |  |  | 5.75 |  |  | 5.75 |
__________
(1) | Represents the interest rate as of the grant date on US treasury bonds having the same life as the estimated life of the option grants.
(2) | The dividend yield is calculated utilizing the dividends paid for the previous one-year period and the per share price of Common Stock on the date of grant.
(3) | Based on the historical volatility of Common Stock over a period relevant to the related stock option grant.
(4) | The average expected option life is based on an analysis of our historical data.
Time-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following table sets forth time-based restricted stock activity:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Restricted shares outstanding at December 31, 2008 | 329,795 |  |  | $ | 34.21 |
Awarded and issued (1) | 128,384 |  |  | 19.33 |
Vested (2) | (132,779 | ) |  | 33.38 |
Forfeited | (9,326 | ) |  | 31.26 |
Restricted shares outstanding at December 31, 2009 | 316,074 |  |  | 28.60 |
Awarded and issued (1) | 88,930 |  |  | 29.05 |
Vested (2) | (138,745 | ) |  | 31.81 |
Forfeited | (1,933 | ) |  | 25.86 |
Restricted shares outstanding at December 31, 2010 | 264,326 |  |  | 27.08 |
Awarded and issued (1) | 76,966 |  |  | 33.70 |
Vested (2) | (116,631 | ) |  | 30.64 |
Restricted shares outstanding at December 31, 2011 | 224,661 |  |  | $ | 28.02 |
__________
(1) | The fair value at grant date of time-based restricted stock issued during the years ended December 31, 2011, 2010 and 2009 was $2.6 million, $2.6 million and $2.5 million, respectively.
(2) | The vesting date fair value of time-based restricted stock that vested during the years ended December 31, 2011, 2010 and 2009 was $3.9 million, $4.3 million and $2.9 million, respectively.
Total Return-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following table sets forth total return-based and other types of performance-based restricted stock activity:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Restricted shares outstanding at December 31, 2008 | 151,342 |  |  | $ | 33.39 |
Awarded and issued (1) | 127,594 |  |  | 15.01 |
Vested (2) | (68,929 | ) |  | 32.66 |
Forfeited | (7,232 | ) |  | 34.14 |
Restricted shares outstanding at December 31, 2009 | 202,775 |  |  | 22.05 |
Awarded and issued (1) | 77,624 |  |  | 29.05 |
Vested (2) | (47,257 | ) |  | 38.50 |
Forfeited | (1,307 | ) |  | 22.99 |
Restricted shares outstanding at December 31, 2010 | 231,835 |  |  | 21.03 |
Awarded and issued (1) | 57,386 |  |  | 41.02 |
Vested (2) | (66,417 | ) |  | 13.79 |
Forfeited/cancelled | (99,975 | ) |  | 13.79 |
Restricted shares outstanding at December 31, 2011 | 122,829 |  |  | $ | 34.86 |
__________
(1) | The fair value at grant date of total return-based restricted stock issued during the years ended December 31, 2011, 2010 and 2009 was $2.4 million, $2.3 million and $1.9 million, respectively. There were no performance-based restricted stock issued subsequent to 2008.
(2) | The vesting date fair value of total return-based and other types performance-based restricted stock that vested during the years ended December 31, 2011, 2010 and 2009 was $2.0 million, $1.6 million and $2.6 million, respectively
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | During 2011, 2010 and 2009, we issued shares of total return-based restricted stock to officers that will vest from zero to 250% based on (1) our absolute total returns for the three-year periods ended December 31, 2012, 2013 and 2014, respectively, relative to defined target returns and (2) whether our total return exceeds the average total returns of a selected group of peer companies. The grant date fair value of such shares of total return-based restricted stock was determined to be $41.02, $29.05 and $15.01, respectively, of the market value of a share of Common Stock as of the grant date and is amortized over the respective three-year period. The fair values of the total return-based restricted stock granted were determined at the grant dates using the following assumptions:
| 2011 |  | 2010 |  | 2009
Risk free interest rate (1) | 1.0 | % |  | 1.3 | % |  | 1.3 | %
Common stock dividend yield (2) | 5.4 | % |  | 5.6 | % |  | 7.6 | %
Expected volatility (3) | 42.8 | % |  | 42.5 | % |  | 37.8 | %
__________
(1) | Represents the interest rate as of the grant date on US treasury bonds having the same life as the estimated life of the total return-based restricted stock grants.
(2) | The dividend yield is calculated utilizing the dividends paid for the previous one-year period and the per share price of Common Stock on the date of grant.
(3) | Based on the historical volatility of Common Stock over a period relevant to the related total return-based restricted stock grant.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: 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 2: 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 3: 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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- 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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Paragraph 29 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph 9 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802392&loc=d3e177068-122764 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21300-112643 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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