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Common Stock Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Plan disclosures |  |  |
Share-based compensation costs recognized | $ 10.4 | $ 12.0 | $ 20.8
Additional disclosures |  |  |
Remaining unamortized share-based compensation expense | $ 13.9 |  |
Vesting rights percentage | 20.00% |  |
Stock options outstanding | 0 | 0 | 0
Total award value relative to the MSCI US REIT Index (as a percent) | 50.00% | 60.00% |
TSR relative to NAREIT Freestanding Index (as a percent) | 20.00% | 20.00% |
Dividend per share growth rate (as a percent) | 20.00% |  |
Debt-to-EBITDA ratio (as a percent) | 10.00% | 20.00% |
Non-employee director |  |  |
Number of shares |  |  |
Shares granted | 28,000 |  |
Additional disclosures |  |  |
Shares granted | 28,000 |  |
Granted shares that vest immediately | 12,000 |  |
Granted Shares that Vest over one Year Service Period | 8,000 |  |
Granted shares that vest over three year service period | 8,000 |  |
Non-employee director | Less than six years of service |  |  |
Additional disclosures |  |  |
Years of service | 6 years |  |
Vesting rights percentage | 33.33% |  |
Non-employee director | Six years of service |  |  |
Additional disclosures |  |  |
Years of service | 6 years |  |
Vesting rights percentage | 50.00% |  |
Non-employee director | Seven years of service |  |  |
Additional disclosures |  |  |
Years of service | 7 years |  |
Vesting rights percentage | 100.00% |  |
Employee | Age 55 and below |  |  |
Additional disclosures |  |  |
Vesting rights percentage | 20.00% |  |
Employee | Age 56 |  |  |
Additional disclosures |  |  |
Vesting rights percentage | 25.00% |  |
Eligible age of employees for vesting of awards | 56 years |  |
Employee | Age 57 |  |  |
Additional disclosures |  |  |
Vesting rights percentage | 33.33% |  |
Eligible age of employees for vesting of awards | 57 years |  |
Employee | Age 58 |  |  |
Additional disclosures |  |  |
Vesting rights percentage | 50.00% |  |
Eligible age of employees for vesting of awards | 58 years |  |
Employee | Age 59 |  |  |
Additional disclosures |  |  |
Vesting rights percentage | 100.00% |  |
Eligible age of employees for vesting of awards | 59 years |  |
Employee | Age 60 and above |  |  |
Additional disclosures |  |  |
Eligible age of employees for vesting of awards | 60 years |  |
Non-executive employees |  |  |
Additional disclosures |  |  |
Years of service | 6 months |  |
Minimum | Non-employee director | Eight or more years of service |  |  |
Additional disclosures |  |  |
Years of service | 8 years |  |
Maximum | Employee | Age 55 and below |  |  |
Additional disclosures |  |  |
Eligible age of employees for vesting of awards | 55 years |  |
Restricted Stock |  |  |
Number of shares |  |  |
Outstanding nonvested shares, beginning of year | 527,176 | 722,263 | 895,550
Shares granted | 161,949 | 262,655 | 484,060
Shares vested | (205,248) | (440,348) | (654,650)
Shares forfeited | (27,595) | (17,394) | (2,697)
Outstanding nonvested shares, end of each period | 456,282 | 527,176 | 722,263
Weighted average price |  |  |
Outstanding nonvested shares, beginning of year (in dollars per share) | $ 29.02 | $ 23.37 | $ 19.94
Shares granted (in dollars per share) | 50.87 | 39.87 | 41.13
Shares vested (in dollars per share) | 37.70 | 36.88 | 30.91
Shares forfeited (in dollars per share) | 45.58 | 39.07 | 37.30
Outstanding nonvested shares, end of each period (in dollars per share) | $ 30.46 | $ 29.02 | $ 23.37
Additional disclosures |  |  |
Shares granted | 161,949 | 262,655 | 484,060
Granted shares that vest immediately | 4,964 |  |
Vesting period | 5 years |  |
Shares granted (in dollars per share) | $ 50.87 | $ 39.87 | $ 41.13
Restricted Stock | Non-executive employees |  |  |
Additional disclosures |  |  |
Number of shares of nonvested stock to be received after six full months of employment | 200 |  |
Vesting period | 5 years |  |
Performance shares |  |  |
Number of shares |  |  |
Outstanding nonvested shares, beginning of year | 59,405 |  |
Shares granted | 55,716 | 71,705 |
Shares vested |  | (4,067) |
Shares forfeited |  | (8,233) |
Outstanding nonvested shares, end of each period | 115,121 | 59,405 |
Weighted average price |  |  |
Outstanding nonvested shares, beginning of year (in dollars per share) | $ 41.46 |  |
Shares granted (in dollars per share) | 52.78 | $ 41.46 |
Shares vested (in dollars per share) |  | 41.46 |
Shares forfeited (in dollars per share) |  | 41.46 |
Outstanding nonvested shares, end of each period (in dollars per share) | $ 46.94 | $ 41.46 |
Additional disclosures |  |  |
Shares granted | 55,716 | 71,705 |
Remaining unamortized share-based compensation expense | $ 3.2 |  |
Awards vesting on the first and second January1 after the end of the three year performance period (as a percent) | 50.00% |  |
Shares granted (in dollars per share) | $ 52.78 | $ 41.46 |
Restricted Stock Units |  |  |
Number of shares |  |  |
Shares granted | 10,269 |  |
Additional disclosures |  |  |
Shares granted | 10,269 |  |
Vesting period | 5 years |  |
2012 Plan |  |  |
Plan disclosures |  |  |
Plan term from the date of adoption | 10 years |  |
2012 Plan | Maximum |  |  |
Plan disclosures |  |  |
Authorized shares | 3,985,734 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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