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Equity and Capital Equity and Capital - Common Stock (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 16, 2017 USD ($) | Jan. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | $ 150,617,000 |  | $ 150,617,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | $ 24,164,000 |  | 24,164,000 |  |  |
Partners' Capital Account, Contributions |  |  |  |  | $ 13,441,000 | $ 8,600,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Equity Issuances, Common Shares Authorized for Issuance | shares |  |  | 500,000,000 |  | 500,000,000 |  |  |
Equity Offering, Common Shares Authorized for Issuance | shares |  |  | 3,100,000 |  | 3,100,000 |  |  |
Forward Equity Offering, Common Shares available for issue | shares |  |  | 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 |  |  | $ 3,071,000 | $ 2,500,000 | $ 5,726,000 | 4,952,000 |  |
Accumulated other comprehensive loss |  |  | $ (16,751,000) | (81,120,000) | $ (16,751,000) | (81,120,000) | $ (18,647,000) | $ (59,478,000)
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Forward Equity Offering, Agreement Price Per Share, Common Stock | $ / shares |  |  | $ 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 |  |  |  |  | $ 5,638,000 | 4,874,000 |  |
Accumulated other comprehensive loss |  |  | $ (16,435,000) | $ (80,038,000) | $ (16,435,000) | $ (80,038,000) | (18,346,000) | $ (58,693,000)
ATM Equity Offering Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  |  | 182,787 |  |
Weighted Average Price Per Share | $ / shares |  |  |  |  |  | $ 68.85 |  |
Net proceeds from common stock issuance |  |  |  |  |  | $ 12,584,000 |  |
Payments for Commissions |  |  |  |  |  | 157,000 |  |
Forward Equity Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  | 1,850,000 |  |  |
Net proceeds from common stock issuance |  |  |  |  | $ 137,500,000 |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | (16,435,000) |  | (16,435,000) |  | $ (18,346,000) |
Net proceeds from common stock issuance |  |  |  |  | $ 0 | 149,788,000 |  |
Conversion of Stock, Conversion Ratio |  |  |  |  | 0.45 |  |  |
Shares of common stock issued for merger (in shares) | shares |  |  |  |  | 65,500,000 |  |  |
Partners' Capital Account, Contributions |  |  |  |  | $ 13,441,000 | 8,600,000 |  |
Parent Company [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Partners' Capital Account, Contributions |  |  |  |  | 0 | 0 |  |
Parent Company [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Partners' Capital Account, Contributions |  |  |  |  | 0 | $ 0 |  |
Series 6 [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stated rate on preferred stock | 6.625% |  |  |  |  |  |  |
Redemption value | $ 250,000,000 |  |  |  |  |  |  |
Series 6 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |
Stated rate on preferred stock |  |  |  |  | 6.625% |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  |  | $ 25.21 |  | $ 25.21 |  |  |
Redemption value |  |  | $ 252,000,000 |  | $ 252,000,000 |  |  |
Series 7 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 75,000,000 |  | $ 75,000,000 |  |  |
Stated rate on preferred stock |  |  |  |  | 6.00% |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  |  | $ 25.22 |  | $ 25.22 |  |  |
Redemption value |  |  | $ 75,700,000.0 |  | $ 75,700,000.0 |  |  |
Notes Due February 1, 2047 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Term of debt |  | 30 years |  |  |  |  |  |
Face amount |  | $ 300,000,000 |  |  |  |  |  |

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