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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Data [Abstract] |
Quarterly Financial Information [Text Block] | Quarterly Financial Data (Unaudited) The table below summarizes our unaudited quarterly financial data for 2014 and 2013.
| 2014 Quarters |  | Total
| First |  | Second |  | Third |  | Fourth |  | Year
Revenues from continuing operations | $ | 1,019,719 |  |  | $ | 1,015,049 |  |  | $ | 964,114 |  |  | $ | 847,282 |  |  | $ | 3,846,164 |
Operating income | $ | 35,402 |  |  | $ | 31,257 |  |  | $ | 35,268 |  |  | $ | 30,624 |  |  | $ | 132,551 |
Income from continuing operations | $ | 29,775 |  |  | $ | 21,148 |  |  | $ | 29,113 |  |  | $ | 26,166 |  |  | $ | 106,202 |
Net income | $ | 29,775 |  |  | $ | 21,148 |  |  | $ | 29,113 |  |  | $ | 26,166 |  |  | $ | 106,202 |
Basic and diluted net income per common unit: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.34 |  |  | $ | 0.24 |  |  | $ | 0.33 |  |  | $ | 0.28 |  |  | $ | 1.18 |
Net income per common unit | $ | 0.34 |  |  | $ | 0.24 |  |  | $ | 0.33 |  |  | $ | 0.28 |  |  | $ | 1.18 |
Cash distributions per common unit (1) | $ | 0.5350 |  |  | $ | 0.5500 |  |  | $ | 0.5650 |  |  | $ | 0.5800 |  |  | $ | 2.2300 |
| 2013 Quarters |  | Total
| First |  | Second |  | Third |  | Fourth |  | Year
Revenues from continuing operations | $ | 1,014,808 |  |  | $ | 1,068,694 |  |  | $ | 1,090,293 |  |  | $ | 961,035 |  |  | $ | 4,134,830 |
Operating income | $ | 30,005 |  |  | $ | 33,360 |  |  | $ | 24,092 |  |  | $ | 23,300 |  |  | $ | 110,757 |
Income from continuing operations | $ | 22,704 |  |  | $ | 26,612 |  |  | $ | 17,966 |  |  | $ | 16,722 |  |  | $ | 84,004 |
Loss from discontinued operations | $ | 143 |  |  | $ | 290 |  |  | $ | 508 |  |  | $ | 1,164 |  |  | $ | 2,105 |
Net income | $ | 22,847 |  |  | $ | 26,902 |  |  | $ | 18,474 |  |  | $ | 17,886 |  |  | $ | 86,109 |
Basic and diluted net income per common unit: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.28 |  |  | $ | 0.32 |  |  | $ | 0.21 |  |  | $ | 0.19 |  |  | $ | 1.00 |
Discontinued operations | $ | — |  |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.03 |
Net income per common unit | $ | 0.28 |  |  | $ | 0.33 |  |  | $ | 0.22 |  |  | $ | 0.20 |  |  | $ | 1.03 |
Cash distributions per common unit (1) | $ | 0.4850 |  |  | $ | 0.4975 |  |  | $ | 0.5100 |  |  | $ | 0.5225 |  |  | $ | 2.0150 |
(1) | Represents cash distributions declared and paid in the applicable period.
Summary of Quarterly Financial Data |
| 2014 Quarters |  | Total
| First |  | Second |  | Third |  | Fourth |  | Year
Revenues from continuing operations | $ | 1,019,719 |  |  | $ | 1,015,049 |  |  | $ | 964,114 |  |  | $ | 847,282 |  |  | $ | 3,846,164 |
Operating income | $ | 35,402 |  |  | $ | 31,257 |  |  | $ | 35,268 |  |  | $ | 30,624 |  |  | $ | 132,551 |
Income from continuing operations | $ | 29,775 |  |  | $ | 21,148 |  |  | $ | 29,113 |  |  | $ | 26,166 |  |  | $ | 106,202 |
Net income | $ | 29,775 |  |  | $ | 21,148 |  |  | $ | 29,113 |  |  | $ | 26,166 |  |  | $ | 106,202 |
Basic and diluted net income per common unit: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.34 |  |  | $ | 0.24 |  |  | $ | 0.33 |  |  | $ | 0.28 |  |  | $ | 1.18 |
Net income per common unit | $ | 0.34 |  |  | $ | 0.24 |  |  | $ | 0.33 |  |  | $ | 0.28 |  |  | $ | 1.18 |
Cash distributions per common unit (1) | $ | 0.5350 |  |  | $ | 0.5500 |  |  | $ | 0.5650 |  |  | $ | 0.5800 |  |  | $ | 2.2300 |
| 2013 Quarters |  | Total
| First |  | Second |  | Third |  | Fourth |  | Year
Revenues from continuing operations | $ | 1,014,808 |  |  | $ | 1,068,694 |  |  | $ | 1,090,293 |  |  | $ | 961,035 |  |  | $ | 4,134,830 |
Operating income | $ | 30,005 |  |  | $ | 33,360 |  |  | $ | 24,092 |  |  | $ | 23,300 |  |  | $ | 110,757 |
Income from continuing operations | $ | 22,704 |  |  | $ | 26,612 |  |  | $ | 17,966 |  |  | $ | 16,722 |  |  | $ | 84,004 |
Loss from discontinued operations | $ | 143 |  |  | $ | 290 |  |  | $ | 508 |  |  | $ | 1,164 |  |  | $ | 2,105 |
Net income | $ | 22,847 |  |  | $ | 26,902 |  |  | $ | 18,474 |  |  | $ | 17,886 |  |  | $ | 86,109 |
Basic and diluted net income per common unit: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.28 |  |  | $ | 0.32 |  |  | $ | 0.21 |  |  | $ | 0.19 |  |  | $ | 1.00 |
Discontinued operations | $ | — |  |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.03 |
Net income per common unit | $ | 0.28 |  |  | $ | 0.33 |  |  | $ | 0.22 |  |  | $ | 0.20 |  |  | $ | 1.03 |
Cash distributions per common unit (1) | $ | 0.4850 |  |  | $ | 0.4975 |  |  | $ | 0.5100 |  |  | $ | 0.5225 |  |  | $ | 2.0150 |
(1) | Represents cash distributions declared and paid in the applicable period.

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