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Employee Benefit 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 Stock by Class | The following table sets forth the Company's Preferred Stock:
|  | Issue Date |  | Number of Shares Outstanding |  | Carrying Value |  | Liquidation Preference Per Share |  | Optional Redemption Date |  | Annual Dividends Payable Per Share
|  |  |  | (in thousands) |  |  |  |  |  |  |  |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,892 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,920 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
The following table sets forth the number of shares of Common Stock reserved for future issuance under the Company's long-term equity incentive plans:
| December 31,
| 2017 |  | 2016
Outstanding stock options and warrants | 655,822 |  |  | 602,115 |
Possible future issuance under equity incentive plans | 2,404,131 |  |  | 2,718,296 |
| 3,059,953 |  |  | 3,320,411 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | The following table sets forth stock option activity:
| Options Outstanding
| Number of Options |  | Weighted Average Exercise Price
Stock options outstanding at December 31, 2014 | 577,321 |  |  | $ | 34.92 |
Granted | 197,408 |  |  | 45.61 |
Canceled | (3,829 | ) |  | 40.21 |
Exercised | (83,672 | ) |  | 34.89 |
Stock options outstanding at December 31, 2015 | 687,228 |  |  | 37.97 |
Granted | 244,664 |  |  | 43.55 |
Canceled | (14,743 | ) |  | 42.64 |
Exercised | (330,034 | ) |  | 34.26 |
Stock options outstanding at December 31, 2016 | 587,115 |  |  | 42.26 |
Granted | 168,748 |  |  | 52.49 |
Exercised | (115,041 | ) |  | 40.41 |
Stock options outstanding at December 31, 2017 (1) (2) | 640,822 |  |  | $ | 45.29 |
__________
(1) | The outstanding options at December 31, 2017 had a weighted average remaining life of 7.7 years.
(2) | The Company had 152,745 options exercisable at December 31, 2017 with a weighted average exercise price of $41.39, weighted average remaining life of 6.4 years and intrinsic value of $1.5 million. Of these exercisable options, there were no exercise prices higher than the market price of our Common Stock at December 31, 2017.
Schedule of NonQualified Deferred Compensation Liability | The following table sets forth our deferred compensation liability:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Beginning deferred compensation liability | $ | 2,451 |  |  | $ | 2,736 |  |  | $ | 3,635 |
Mark-to-market adjustment to deferred compensation (in general and administrative expenses) | 492 |  |  | 222 |  |  | (32 | )
Distributions from deferred compensation plans | (555 | ) |  | (507 | ) |  | (867 | )
Total deferred compensation liability | $ | 2,388 |  |  | $ | 2,451 |  |  | $ | 2,736 |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average fair values of options granted during 2017, 2016 and 2015 were $6.72, $4.61 and $6.19, respectively, per option. The fair values of the options granted were determined at the grant dates using the following assumptions:
| 2017 |  | 2016 |  | 2015
Risk free interest rate (1) | 2.0 | % |  | 1.4 | % |  | 1.7 | %
Common stock dividend yield (2) | 3.4 | % |  | 3.9 | % |  | 3.7 | %
Expected volatility (3) | 19.5 | % |  | 19.7 | % |  | 22.4 | %
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 then current regular dividend rate for a 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 the Company's 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 | 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, 2014 | 222,068 |  |  | $ | 35.97 |
Awarded and issued (1) | 71,994 |  |  | 45.91 |
Vested (2) | (85,809 | ) |  | 35.14 |
Forfeited | (3,533 | ) |  | 39.94 |
Restricted shares outstanding at December 31, 2015 | 204,720 |  |  | 39.74 |
Awarded and issued (1) | 72,698 |  |  | 43.59 |
Vested (2) | (84,212 | ) |  | 37.76 |
Forfeited | (4,225 | ) |  | 41.96 |
Restricted shares outstanding at December 31, 2016 | 188,981 |  |  | 42.06 |
Awarded and issued (1) | 61,404 |  |  | 52.49 |
Vested (2) | (78,139 | ) |  | 40.55 |
Restricted shares outstanding at December 31, 2017 | 172,246 |  |  | $ | 46.46 |
__________
(1) | The weighted average fair value at grant date of time-based restricted stock issued during the years ended December 31, 2017, 2016 and 2015 was $3.2 million, $3.2 million and $3.3 million, respectively.
(2) | The vesting date fair value of time-based restricted stock that vested during the years ended December 31, 2017, 2016 and 2015 was $4.1 million, $3.7 million and $3.9 million, respectively. Vested shares include those shares surrendered by employees to satisfy tax withholding obligations in connection with such vesting.
Total Return-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair values of the total return-based restricted stock granted were determined at the grant dates using a Monte Carlo simulation model and the following assumptions:
| 2017 |  | 2016 |  | 2015
Risk free interest rate (1) | 1.6 | % |  | 0.9 | % |  | 1.0 | %
Common stock dividend yield (2) | 3.5 | % |  | 4.1 | % |  | 3.8 | %
Expected volatility (3) | 42.8 | % |  | 43.1 | % |  | 43.0 | %
__________
(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 then current regular dividend rate for a one-year period and the average per share price of Common Stock during the three-month period preceding 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.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table sets forth total return-based restricted stock activity:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Restricted shares outstanding at December 31, 2014 | 207,957 |  |  | $ | 35.70 |
Awarded and issued (1) (3) | 118,817 |  |  | 37.64 |
Vested (2) (3) | (129,762 | ) |  | 31.97 |
Forfeited | (1,709 | ) |  | 37.25 |
Restricted shares outstanding at December 31, 2015 | 195,303 |  |  | 36.66 |
Awarded and issued (1) (3) | 64,701 |  |  | 40.87 |
Vested (2) (3) | (71,617 | ) |  | 36.50 |
Forfeited | (4,663 | ) |  | 39.91 |
Restricted shares outstanding at December 31, 2016 | 183,724 |  |  | 39.82 |
Awarded and issued (1) (3) | 84,013 |  |  | 44.76 |
Vested (2) (3) | (107,013 | ) |  | 37.88 |
Restricted shares outstanding at December 31, 2017 | 160,724 |  |  | $ | 44.72 |
__________
(1) | The fair value at grant date of total return-based restricted stock issued during the years ended December 31, 2017, 2016 and 2015 was $2.4 million, $2.4 million and $2.5 million, respectively, at target.
(2) | The vesting date fair value of total return-based restricted stock that vested during the years ended December 31, 2017, 2016 and 2015 was $5.6 million, $3.1 million and $5.9 million, respectively, based on the performance of the specific plans. Vested shares include those shares surrendered by employees to satisfy tax withholding obligations in connection with such vesting.
(3) | The 2017, 2016 and 2015 amounts include 34,669, 6,647 and 61,860 additional shares, respectively, that were issued at the end of the applicable measurement period because actual performance exceeded certain levels of performance.

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- Definition Schedule of non-qualified deferred compensation liability. Dislcosure represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 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=96867065&loc=d3e5047-113901 + 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 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 2: 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=65877616&loc=d3e177068-122764 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 6: 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=84159872&loc=d3e21553-112644 Reference 7: 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=84159872&loc=d3e21475-112644 Reference 8: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: 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=65888546&loc=d3e21300-112643 Reference 10: 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(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 11: 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=84159872&loc=d3e21521-112644 Reference 12: 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=84159872&loc=d3e21484-112644 Reference 13: 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=84159872&loc=d3e21538-112644 Reference 14: 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=84159872&loc=d3e21488-112644 + Details
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