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Equity and Capital Equity and Capital - Common Stock (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 13, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  | Jun. 30, 2016 |  |  |  |
Equity Issuances, Amount Available for Issuance |  | $ 70,800,000.0 |  | $ 70,800,000.0 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  | 423,076,000 |  | 423,076,000 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  | $ 62,461,000 |  | $ 62,461,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Equity Issuances, Common Shares Authorized for Issuance |  | 200,000,000 |  | 200,000,000 |  |  |  |
Equity Offering, Common Shares Authorized for Issuance |  | 3,100,000 |  | 3,100,000 |  |  |  |
Forward Equity Offering, Common Shares available for issue |  | 1,250,000 |  | 1,250,000 |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | $ 2,500,000 | $ 2,250,000 | $ 4,952,000 | $ 4,500,000 |  |  |
Accumulated other comprehensive loss |  | $ (81,120,000) | (49,534,000) | $ (81,120,000) | (49,534,000) |  | $ (59,478,000) | $ (58,498,000)
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Forward Equity Offering, Agreement Price Per Share, Common Stock |  | $ 75.25 |  | $ 75.25 |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | $ 4,874,000 | 4,421,000 |  |  |
Accumulated other comprehensive loss |  | $ (80,038,000) | $ (48,799,000) | $ (80,038,000) | $ (48,799,000) |  | $ (58,693,000) | $ (57,748,000)
ATM Equity Offering Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  |  | 182,787 | 18,125 |  |  |
Weighted Average Price Per Share |  |  |  | $ 68.85 | $ 64.72 |  |  |
Net proceeds from common stock issuance |  |  |  | $ 12,584,000 | $ 1,173,000 |  |  |
Payments for Commissions |  |  |  | $ 157,000 | $ 15,000 |  |  |
Forward Equity Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  |  | 1,850,000 |  |  |  |
Net proceeds from common stock issuance |  |  |  | $ 137,500,000 |  |  |  |
Equity Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued | 5,000,000 |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ 79.78 |  |  |  |  |  |  |
Net proceeds from common stock issuance | $ 400,100,000 |  |  |  |  |  |  |
Unsecured Debt [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Notice of Repayment of Unsecured Debt, Subsequent to Period End Date |  |  |  |  |  | $ 300,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.875% |  |

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